Mecca bound: the challenges ahead.
Memish
Ziad A
ZA
Department of Medicine, King Fahad National Guard Hospital, Riyadh, Saudi Arabia.
Ahmed
Qanta A A
QA
D003140:Communicable Disease Control / Q000458:organization & administration*; D006801:Humans; D007514:Islam; D011634:Public Health; D012529:Saudi Arabia; D014195:Travel