Study registration: *
Publication Regev-Yochay G, Lancet Reg Health, 2021
Dates: 2020-12-19 to 2021-03-14
Funding: Not reported/unclear
Conflict of interest: no COI (GRY received grants for work on pneumococcal disease from Pfizer and for work on volatile organic compounds and COVID-19 form Nanosens. YK nothing to declare)