| 1923 | Humans (MeSH) |
| 1386 | COVID-19 (MeSH) |
| 1283 | SARS-CoV-2 (MeSH) |
| 1051 | Pandemics (MeSH) |
| 831 | Betacoronavirus (MeSH) |
| 762 | Coronavirus Infections (epidemiology) |
| 760 | Female (MeSH) |
| 757 | Pneumonia, Viral (epidemiology) |
| 714 | Male (MeSH) |
| 565 | Adult (MeSH) |
| 480 | Middle Aged (MeSH) |
| 463 | Pandemics (prevention & control) |
| 430 | Coronavirus Infections (prevention & control) |
| 422 | Pneumonia, Viral (prevention & control) |
| 345 | COVID-19 (epidemiology) |
| 336 | Aged (MeSH) |
| 308 | Young Adult (MeSH) |
| 305 | Adolescent (MeSH) |
| 267 | Surveys and Questionnaires (MeSH) |
| 234 | Pneumonia, Viral (MeSH) |
| 227 | Coronavirus Infections (MeSH) |
| 223 | COVID-19 (prevention & control) |
| 219 | Quarantine (MeSH) |
| 206 | Child (MeSH) |
| 199 | Italy (epidemiology) |
| 187 | Coronavirus Infections (transmission) |
| 186 | Pneumonia, Viral (transmission) |
| 184 | Cross-Sectional Studies (MeSH) |
| 168 | Pneumonia, Viral (psychology) |
| 168 | Coronavirus Infections (psychology) |
| 149 | Aged, 80 and over (MeSH) |
| 147 | Communicable Disease Control (MeSH) |
| 139 | Retrospective Studies (MeSH) |
| 131 | Quarantine (psychology) |
| 129 | Pneumonia, Viral (virology) |
| 129 | Coronavirus Infections (virology) |
| 128 | COVID-19 (psychology) |
| 118 | India (epidemiology) |
| 115 | Communicable Disease Control (methods) |
| 105 | Child, Preschool (MeSH) |
| 103 | Mental Health (MeSH) |
| 96 | Social Isolation (MeSH) |
| 96 | Coronavirus Infections (diagnosis) |
| 95 | Italy (MeSH) |
| 93 | Physical Distancing (MeSH) |
| 85 | China (epidemiology) |
| 80 | Infant (MeSH) |
| 80 | India (MeSH) |
| 79 | Time Factors (MeSH) |
| 79 | Incidence (MeSH) |
| 79 | COVID-19 (transmission) |
| 78 | Anxiety (epidemiology) |
| 77 | Risk Factors (MeSH) |
| 77 | Environmental Monitoring (MeSH) |
| 76 | Pneumonia, Viral (diagnosis) |
| 73 | Betacoronavirus (isolation & purification) |
| 68 | Air Pollution (analysis) |
| 67 | Quarantine (statistics & numerical data) |
| 66 | United Kingdom (epidemiology) |
| 66 | Cities (MeSH) |
| 63 | Air Pollutants (analysis) |
| 61 | Spain (epidemiology) |
| 61 | Quarantine (methods) |
| 61 | Particulate Matter (analysis) |
| 58 | Models, Theoretical (MeSH) |
| 57 | Prevalence (MeSH) |
| 56 | Social Isolation (psychology) |
| 55 | Socioeconomic Factors (MeSH) |
| 55 | Depression (epidemiology) |
| 54 | Public Health (MeSH) |
| 54 | Pandemics (statistics & numerical data) |
| 54 | Infant, Newborn (MeSH) |
| 54 | Disease Outbreaks (MeSH) |
| 54 | Adaptation, Psychological (MeSH) |
| 53 | Pneumonia, Viral (mortality) |
| 53 | Coronavirus Infections (mortality) |
| 53 | COVID-19 Testing (MeSH) |
| 50 | Exercise (MeSH) |
| 49 | Hospitalization (statistics & numerical data) |
| 49 | Health Policy (MeSH) |
| 49 | Communicable Disease Control (organization & administration) |
| 48 | Pneumonia, Viral (therapy) |
| 48 | Coronavirus Infections (therapy) |
| 47 | United Kingdom (MeSH) |
| 47 | Telemedicine (MeSH) |
| 47 | Pneumonia, Viral (complications) |
| 47 | Coronavirus Infections (complications) |
| 46 | Age Factors (MeSH) |
| 45 | France (epidemiology) |
| 44 | Stress, Psychological (epidemiology) |
| 44 | Models, Statistical (MeSH) |
| 44 | Anxiety (psychology) |
| 43 | Health Services Accessibility (MeSH) |
| 42 | Emergency Service, Hospital (statistics & numerical data) |
| 42 | Disease Transmission, Infectious (prevention & control) |
| 42 | Coronavirus (MeSH) |
| 42 | COVID-19 (virology) |
| 41 | Betacoronavirus (pathogenicity) |
| 40 | China (MeSH) |
| 35 | SARS-CoV-2 (isolation & purification) |
| 35 | Pregnancy (MeSH) |
| 35 | Life Style (MeSH) |
| 34 | Sedentary Behavior (MeSH) |
| 34 | Longitudinal Studies (MeSH) |
| 33 | Risk Assessment (MeSH) |
| 33 | Health Knowledge, Attitudes, Practice (MeSH) |
| 32 | Stress, Psychological (psychology) |
| 32 | Spain (MeSH) |
| 32 | Prospective Studies (MeSH) |
| 32 | Infection Control (methods) |
| 32 | Animals (MeSH) |
| 31 | Telemedicine (methods) |
| 31 | Pandemics (economics) |
| 31 | COVID-19 (complications) |
| 30 | Pneumonia, Viral (economics) |
| 30 | Internet (MeSH) |
| 30 | Coronavirus Infections (economics) |
| 29 | Universities (MeSH) |
| 29 | Psychological Distress (MeSH) |
| 29 | Global Health (MeSH) |
| 29 | Germany (epidemiology) |
| 29 | Depression (psychology) |
| 29 | Contact Tracing (MeSH) |
| 28 | Travel (MeSH) |
| 28 | Forecasting (MeSH) |
| 28 | Clinical Laboratory Techniques (MeSH) |
| 27 | United States (epidemiology) |
| 27 | SARS-CoV-2 (pathogenicity) |
| 27 | Models, Biological (MeSH) |
| 27 | Mental Disorders (epidemiology) |
| 27 | Infection Control (MeSH) |
| 27 | Delivery of Health Care (MeSH) |
| 27 | Cohort Studies (MeSH) |
| 26 | Sex Factors (MeSH) |
| 26 | Basic Reproduction Number (MeSH) |
| 25 | Social Support (MeSH) |
| 25 | Sleep (MeSH) |
| 25 | Quality of Life (MeSH) |
| 25 | Follow-Up Studies (MeSH) |
| 24 | Europe (epidemiology) |
| 24 | Disease Outbreaks (prevention & control) |
| 24 | COVID-19 (diagnosis) |
| 23 | Public Policy (MeSH) |
| 23 | Mental Health (statistics & numerical data) |
| 23 | Computer Simulation (MeSH) |
| 23 | Communicable Disease Control (statistics & numerical data) |
| 22 | Students (psychology) |
| 22 | Europe (MeSH) |
| 22 | Emergency Service, Hospital (MeSH) |
| 22 | Emergencies (MeSH) |
| 22 | Disease Management (MeSH) |
| 22 | COVID-19 (therapy) |
| 21 | Stress, Psychological (MeSH) |
| 21 | South Africa (epidemiology) |
| 21 | Quarantine (legislation & jurisprudence) |
| 21 | Qualitative Research (MeSH) |
| 21 | Pneumonia, Viral (immunology) |
| 21 | Health Behavior (MeSH) |
| 21 | France (MeSH) |
| 21 | Coronavirus Infections (immunology) |
| 21 | Comorbidity (MeSH) |
| 21 | Air Pollution (MeSH) |
| 20 | Prognosis (MeSH) |
| 20 | Patient Admission (statistics & numerical data) |
| 20 | Hospitalization (MeSH) |
| 20 | COVID-19 (mortality) |
| 19 | Treatment Outcome (MeSH) |
| 19 | Social Media (MeSH) |
| 19 | Severity of Illness Index (MeSH) |
| 19 | Feeding Behavior (MeSH) |
| 19 | Delivery of Health Care (organization & administration) |
| 19 | Betacoronavirus (genetics) |
| 19 | Algorithms (MeSH) |
| 18 | United States (MeSH) |
| 18 | Social Behavior (MeSH) |
| 18 | Resilience, Psychological (MeSH) |
| 18 | Registries (MeSH) |
| 18 | Population Surveillance (MeSH) |
| 18 | Parents (psychology) |
| 18 | Mental Disorders (psychology) |
| 18 | Health Surveys (MeSH) |
| 18 | Emotions (MeSH) |
| 18 | Diet (MeSH) |
| 18 | Coronavirus Infections (pathology) |
| 18 | Communication (MeSH) |
| 18 | Age Distribution (MeSH) |
| 17 | Wounds and Injuries (epidemiology) |
| 17 | Telemedicine (organization & administration) |
| 17 | Self Report (MeSH) |
| 17 | Referral and Consultation (MeSH) |
| 17 | Pneumonia, Viral (pathology) |
| 17 | Personal Protective Equipment (MeSH) |
| 17 | New Zealand (epidemiology) |
| 17 | Interpersonal Relations (MeSH) |
| 17 | Government (MeSH) |
| 17 | Emergency Service, Hospital (trends) |
| 16 | Vulnerable Populations (MeSH) |
| 16 | Practice Guidelines as Topic (MeSH) |
| 16 | Masks (MeSH) |
| 16 | Loneliness (MeSH) |
| 16 | Infection Control (organization & administration) |
| 16 | Health Services Needs and Demand (MeSH) |
| 16 | Health Personnel (psychology) |
| 16 | Health Personnel (MeSH) |
| 16 | Germany (MeSH) |
| 16 | Family Characteristics (MeSH) |
| 16 | Education, Distance (MeSH) |
| 16 | Developing Countries (MeSH) |
| 15 | Tertiary Care Centers (MeSH) |
| 15 | Nepal (epidemiology) |
| 15 | Feeding Behavior (psychology) |
| 15 | Fear (MeSH) |
| 15 | Epidemiological Monitoring (MeSH) |
| 14 | Tertiary Care Centers (statistics & numerical data) |
| 14 | Quarantine (trends) |
| 14 | Quarantine (organization & administration) |
| 14 | Patient Admission (trends) |
| 14 | Hospitalization (trends) |
| 14 | Health Status (MeSH) |
| 14 | Exercise (psychology) |
| 14 | England (epidemiology) |
| 14 | Communicable Disease Control (standards) |
| 14 | Betacoronavirus (physiology) |
| 14 | Air Pollutants (MeSH) |
| 13 | Videoconferencing (MeSH) |
| 13 | Telemedicine (statistics & numerical data) |
| 13 | Students (MeSH) |
| 13 | South Africa (MeSH) |
| 13 | Public Health (methods) |
| 13 | Poverty (MeSH) |
| 13 | Particulate Matter (MeSH) |
| 13 | Nitrogen Dioxide (analysis) |
| 13 | Mental Health (trends) |
| 13 | Health Services Accessibility (organization & administration) |
| 13 | Cost of Illness (MeSH) |
| 13 | Contact Tracing (methods) |
| 13 | Blood Glucose (analysis) |
| 12 | Urban Population (MeSH) |
| 12 | Travel (statistics & numerical data) |
| 12 | Stroke (therapy) |
| 12 | Schools (MeSH) |
| 12 | Remote Consultation (MeSH) |
| 12 | Quarantine (economics) |
| 12 | Psychological Distance (MeSH) |
| 12 | Occupational Health (MeSH) |
| 12 | Motivation (MeSH) |
| 12 | Mortality (trends) |
| 12 | Mental Disorders (therapy) |
| 12 | Mass Screening (MeSH) |
| 12 | Hospitals (MeSH) |
| 12 | Health Services Accessibility (trends) |
| 12 | Health Services Accessibility (statistics & numerical data) |
| 12 | Greece (epidemiology) |
| 12 | Emergency Service, Hospital (organization & administration) |
| 12 | Disease Outbreaks (statistics & numerical data) |
| 12 | Case-Control Studies (MeSH) |
| 12 | Caregivers (psychology) |
| 12 | COVID-19 Vaccines (MeSH) |
| 12 | Body Mass Index (MeSH) |
| 12 | Betacoronavirus (immunology) |
| 11 | World Health Organization (MeSH) |
| 11 | Telemedicine (trends) |
| 11 | Societies, Medical (MeSH) |
| 11 | Sex Distribution (MeSH) |
| 11 | Rural Population (MeSH) |
| 11 | Republic of Korea (epidemiology) |
| 11 | Regression Analysis (MeSH) |
| 11 | Public Opinion (MeSH) |
| 11 | Protective Factors (MeSH) |
| 11 | Population Density (MeSH) |
| 11 | Ozone (analysis) |
| 11 | Outcome Assessment, Health Care (MeSH) |
| 11 | Nigeria (epidemiology) |
| 11 | Needs Assessment (MeSH) |
| 11 | Mental Health Services (MeSH) |
| 11 | London (epidemiology) |
| 11 | Infectious Disease Transmission, Patient-to-Professional (prevention & control) |
| 11 | Hypoglycemic Agents (therapeutic use) |
| 11 | Hospital Mortality (MeSH) |
| 11 | Health Status Disparities (MeSH) |
| 11 | Health Care Surveys (MeSH) |
| 11 | Fear (psychology) |
| 11 | Epidemics (MeSH) |
| 11 | Diabetes Mellitus, Type 1 (drug therapy) |
| 11 | Decision Making (MeSH) |
| 11 | Basic Reproduction Number (statistics & numerical data) |
| 11 | Attitude (MeSH) |
| 11 | Asymptomatic Infections (epidemiology) |
| 11 | Artificial Intelligence (MeSH) |
| 11 | Anxiety (MeSH) |
| 10 | Time-to-Treatment (MeSH) |
| 10 | Switzerland (epidemiology) |
| 10 | Students (statistics & numerical data) |
| 10 | Stroke (epidemiology) |
| 10 | Stress, Psychological (etiology) |
| 10 | Quarantine (standards) |
| 10 | Politics (MeSH) |
| 10 | Pilot Projects (MeSH) |
| 10 | Perception (MeSH) |
| 10 | Neoplasms (therapy) |
| 10 | Nasopharynx (virology) |
| 10 | Mobile Applications (MeSH) |
| 10 | Interviews as Topic (MeSH) |
| 10 | Intensive Care Units (statistics & numerical data) |
| 10 | Hospitals, University (MeSH) |
| 10 | Hand Disinfection (MeSH) |
| 10 | Government Regulation (MeSH) |
| 10 | Geography (MeSH) |
| 10 | Family (MeSH) |
| 10 | Exercise (physiology) |
| 10 | Elective Surgical Procedures (MeSH) |
| 10 | Depression (diagnosis) |
| 10 | Communicable Disease Control (legislation & jurisprudence) |
| 10 | Brazil (epidemiology) |
| 10 | Ambulatory Care (statistics & numerical data) |
| 10 | Affect (MeSH) |
| 9 | Workload (statistics & numerical data) |
| 9 | Uncertainty (MeSH) |
| 9 | Telephone (MeSH) |
| 9 | Sleep (physiology) |
| 9 | ST Elevation Myocardial Infarction (therapy) |
| 9 | SARS-CoV-2 (physiology) |
| 9 | SARS-CoV-2 (genetics) |
| 9 | Referral and Consultation (statistics & numerical data) |
| 9 | Pregnancy Complications, Infectious (virology) |
| 9 | Poland (MeSH) |
| 9 | Patient Safety (MeSH) |
| 9 | Patient Acceptance of Health Care (statistics & numerical data) |
| 9 | Patient Acceptance of Health Care (MeSH) |
| 9 | Loneliness (psychology) |
| 9 | Logistic Models (MeSH) |
| 9 | Health Resources (MeSH) |
| 9 | Disease Susceptibility (MeSH) |
| 9 | Disaster Planning (MeSH) |
| 9 | Diabetes Mellitus, Type 1 (epidemiology) |
| 9 | Diabetes Mellitus, Type 1 (blood) |
| 9 | Depression (etiology) |
| 9 | Coronavirus Infections (drug therapy) |
| 9 | COVID-19 (economics) |
| 9 | Blood Glucose (metabolism) |
| 9 | Belgium (epidemiology) |
| 9 | Australia (epidemiology) |
| 9 | Attitude to Health (MeSH) |
| 9 | Attitude of Health Personnel (MeSH) |
| 9 | Alcohol Drinking (epidemiology) |
| 9 | Acute Disease (MeSH) |
| 8 | Weight Gain (MeSH) |
| 8 | Vehicle Emissions (analysis) |
| 8 | Triage (MeSH) |
| 8 | Transients and Migrants (MeSH) |
| 8 | State Medicine (MeSH) |
| 8 | Social Networking (MeSH) |
| 8 | Social Media (statistics & numerical data) |
| 8 | Sleep Wake Disorders (epidemiology) |
| 8 | Sleep Initiation and Maintenance Disorders (psychology) |
| 8 | Sleep Initiation and Maintenance Disorders (epidemiology) |
| 8 | Sensitivity and Specificity (MeSH) |
| 8 | Screen Time (MeSH) |
| 8 | ST Elevation Myocardial Infarction (diagnosis) |
| 8 | Risk (MeSH) |
| 8 | Real-Time Polymerase Chain Reaction (MeSH) |
| 8 | Polymerase Chain Reaction (MeSH) |
| 8 | Pneumonia, Viral (physiopathology) |
| 8 | Personal Protective Equipment (supply & distribution) |
| 8 | Paris (epidemiology) |
| 8 | Netherlands (epidemiology) |
| 8 | Mass Media (MeSH) |
| 8 | Japan (epidemiology) |
| 8 | Israel (epidemiology) |
| 8 | Insulin (therapeutic use) |
| 8 | Information Dissemination (MeSH) |
| 8 | Infection Control (statistics & numerical data) |
| 8 | Glycated Hemoglobin A (analysis) |
| 8 | Forecasting (methods) |
| 8 | Food Supply (MeSH) |
| 8 | Feasibility Studies (MeSH) |
| 8 | Eye Diseases (therapy) |
| 8 | Epidemics (prevention & control) |
| 8 | Disease Transmission, Infectious (statistics & numerical data) |
| 8 | Diabetes Mellitus, Type 1 (virology) |
| 8 | Depression (MeSH) |
| 8 | Databases, Factual (MeSH) |
| 8 | Coronavirus Infections (physiopathology) |
| 8 | Consensus (MeSH) |
| 8 | Clinical Laboratory Techniques (statistics & numerical data) |
| 8 | Cities (epidemiology) |
| 8 | Brazil (MeSH) |
| 8 | Bayes Theorem (MeSH) |
| 8 | Bangladesh (epidemiology) |
| 8 | Appointments and Schedules (MeSH) |
| 8 | Anxiety Disorders (epidemiology) |
| 8 | Antibodies, Viral (blood) |
| 8 | Ambulatory Care (organization & administration) |
| 8 | Ambulatory Care (MeSH) |
| 7 | Wales (epidemiology) |
| 7 | Vulnerable Populations (statistics & numerical data) |
| 7 | Viral Vaccines (MeSH) |
| 7 | Suicidal Ideation (MeSH) |
| 7 | Students, Medical (MeSH) |
| 7 | Stress, Psychological (diagnosis) |
| 7 | Snacks (MeSH) |
| 7 | Singapore (epidemiology) |
| 7 | Severe Acute Respiratory Syndrome (prevention & control) |
| 7 | Severe Acute Respiratory Syndrome (epidemiology) |
| 7 | Severe Acute Respiratory Syndrome (MeSH) |
| 7 | Seroepidemiologic Studies (MeSH) |
| 7 | Scotland (MeSH) |
| 7 | Public Health (legislation & jurisprudence) |
| 7 | Public Health (ethics) |
| 7 | Psychiatric Status Rating Scales (MeSH) |
| 7 | Primary Health Care (organization & administration) |
| 7 | Policy (MeSH) |
| 7 | Patient Selection (MeSH) |
| 7 | Patient Satisfaction (MeSH) |
| 7 | Patient Isolation (MeSH) |
| 7 | Patient Compliance (statistics & numerical data) |
| 7 | Pakistan (MeSH) |
| 7 | Mortality (MeSH) |
| 7 | Mathematical Concepts (MeSH) |
| 7 | Interrupted Time Series Analysis (MeSH) |
| 7 | Intensive Care Units (MeSH) |
| 7 | Inflammatory Bowel Diseases (epidemiology) |
| 7 | Income (statistics & numerical data) |
| 7 | Human Activities (MeSH) |
| 7 | HIV Infections (epidemiology) |
| 7 | HIV Infections (drug therapy) |
| 7 | Guidelines as Topic (MeSH) |
| 7 | Facilities and Services Utilization (trends) |
| 7 | Employment (statistics & numerical data) |
| 7 | Employment (MeSH) |
| 7 | Emergency Medical Services (statistics & numerical data) |
| 7 | Elective Surgical Procedures (statistics & numerical data) |
| 7 | Education, Distance (methods) |
| 7 | Disaster Planning (organization & administration) |
| 7 | Diabetes Mellitus, Type 2 (psychology) |
| 7 | Diabetes Mellitus, Type 2 (epidemiology) |
| 7 | Denmark (epidemiology) |
| 7 | Cross Infection (prevention & control) |
| 7 | Communicable Disease Control (trends) |
| 7 | Cause of Death (MeSH) |
| 7 | Blood Glucose Self-Monitoring (MeSH) |
| 6 | Turkey (MeSH) |
| 6 | Symptom Assessment (MeSH) |
| 6 | Sweden (epidemiology) |
| 6 | Survival Analysis (MeSH) |
| 6 | Stroke (diagnosis) |
| 6 | Stochastic Processes (MeSH) |
| 6 | Social Stigma (MeSH) |
| 6 | Seasons (MeSH) |
| 6 | Schools (organization & administration) |
| 6 | Risk Reduction Behavior (MeSH) |
| 6 | Risk Assessment (methods) |
| 6 | Residence Characteristics (MeSH) |
| 6 | Research Design (MeSH) |
| 6 | Reproducibility of Results (MeSH) |
| 6 | Referral and Consultation (trends) |
| 6 | RNA, Viral (genetics) |
| 6 | RNA, Viral (analysis) |
| 6 | Quality of Life (psychology) |
| 6 | Psychosocial Support Systems (MeSH) |
| 6 | Protein Conformation (MeSH) |
| 6 | Program Evaluation (MeSH) |
| 6 | Professional Role (MeSH) |
| 6 | Pregnancy Complications, Infectious (epidemiology) |
| 6 | Phylogeny (MeSH) |
| 6 | Personnel Staffing and Scheduling (MeSH) |
| 6 | Personal Satisfaction (MeSH) |
| 6 | Personal Protective Equipment (statistics & numerical data) |
| 6 | Percutaneous Coronary Intervention (statistics & numerical data) |
| 6 | Patient Care (MeSH) |
| 6 | Parents (MeSH) |
| 6 | Pakistan (epidemiology) |
| 6 | Ophthalmology (MeSH) |
| 6 | New Zealand (MeSH) |
| 6 | Neoplasms (psychology) |
| 6 | Mothers (psychology) |
| 6 | Mental Health Services (statistics & numerical data) |
| 6 | Mental Disorders (etiology) |
| 6 | Machine Learning (MeSH) |
| 6 | Linear Models (MeSH) |
| 6 | Learning (MeSH) |
| 6 | Internationality (MeSH) |
| 6 | Information Seeking Behavior (MeSH) |
| 6 | Infection Control (standards) |
| 6 | Income (MeSH) |
| 6 | Hygiene (MeSH) |
| 6 | Health Services Needs and Demand (trends) |
| 6 | Health Education (MeSH) |
| 6 | Greece (MeSH) |
| 6 | Genome, Viral (MeSH) |
| 6 | Eye Diseases (complications) |
| 6 | Employment (psychology) |
| 6 | Emergencies (epidemiology) |
| 6 | Ecosystem (MeSH) |
| 6 | Disease Progression (MeSH) |
| 6 | Diabetes Mellitus, Type 1 (therapy) |
| 6 | Dentists (MeSH) |
| 6 | Curriculum (MeSH) |
| 6 | Communicable Disease Control (economics) |
| 6 | Clinical Laboratory Techniques (methods) |
