human 152 Humans 103 Article 59 female 58 adult 57 article 54 male 54 controlled study 38 Female 33 Human resource management 32 Male 30 United States 30 aged 30 major clinical study 29 health care cost 24 middle aged 24 Adult 23 COVID-19 22 retrospective study 22 Retrospective Studies 21 economics 21 Aged 20 human experiment 20 Middle Aged 19 cohort analysis 19 health care utilization 18 procedures 17 China 15 Health Care Costs 14 health insurance 14