[1] Emory Univ, Sch Med, Atlanta, GA USA
[2] Childrens Healthcare Atlanta, Atlanta, GA USA
[3] Univ British Columbia, Dept Gen Surg, Vancouver, BC V5Z 1M9, Canada
[4] Harvard Humanitarian Initiat, Boston, MA USA
[5] Valley Anesthesiol Consultants Ltd, Phoenix, AZ USA
[6] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA