1. a Department of Global Health , University of Washington , Seattle , WA , USA
2. b Department of Epidemiology , University of Washington , Seattle , WA , USA
3. c Department of Medicine , University of Washington , Seattle , WA , USA
4. d Department of Biostatistics , University of Washington , Seattle , WA , USA
5. e Fred Hutchinson Cancer Research Center, Division of Public Health Sciences , Seattle , WA , USA
6. f Independent consultant , Nairobi , Kenya
7. g Coptic Hope Centre , Coptic Hospital , Nairobi , Kenya