human 265 Humans 209 female 151 male 141 adult 123 Article 105 Female 99 Male 92 COVID-19 90 controlled study 85 Adult 77 middle aged 67 aged 63 article 59 Middle Aged 58 United States 57 major clinical study 57 adolescent 49 Aged 45 child 45 psychology 43 China 41 Adolescent 39 pandemic 39 coronavirus disease 2019 38 young adult 38 Population statistics 36 SARS-CoV-2 34 climate change 34 Young Adult 33