“…There were 15 studies conducted in travelers recruited at airports [8,15e17,20,22,31e33,35e39,43,44] and one onboard flight [41], in Europe [8,15e17,32,37,39], Asia [20,33,36], Australia [36], US [22,38] and Canada [41] before flying abroad or at airports in Africa [31,35,43,44] and Asia [31] before flying back home. Thirteen studies included travelers recruited at travel clinics when seeking travel advice [7,9e12,14,23,24,28,29,34,40,42] in Europe [7,11,12,14,23,24,28,34,40], Australia [9], US [10], Canada [42] and Asia [29].…”