“…Most of the 86 studies applying a cross-sectional study design assessed the psychological impact at a single point in time. Namely, 29 studies performed data collection in earlier phases of the outbreak in the respective country [64-66, 77, 79-81, 84-89, 91, 96, 98, 100, 103, 105, 106, 108, 109, 111-115, 120, 126], nine during the outbreak [69, 73, 82, 95, 97, 101, 110, 118, 125], 32 in later phases [41, 42, 44-46, 50, 53, 54, 56, 59-61, 67, 68, 70-72, 74, 78, 83, 90, 92-94, 102, 104, 107, 117, 119, 121, 122, 124], and eight after the end of the outbreak [47-49, 52, 57, 58, 63, 99]. Another seven studies focusing on SARS [43, 51, 55], MERS [64], and COVID-19 [75, 76, 123] also included follow-up data.…”