Inclusion in terms of (a) proportion of total study participants, or (b) proportion of total studies, relative to their global population proportion and relative to proportion of global DALYs. World region legend: CAN=Canada, EUR=northern, western and southern Europe, AUS=Australia, New Zealand & Pacific, EEUR=eastern Europe, CAM=Central America & Caribbean, MIDE=Middle East, AFR=Africa, SAM=South America, MEX=Mexico.