[1] Northeastern Univ, Boston, MA 02115 USA
[2] Partners Hlth, Boston, MA USA
[3] Aga Khan Univ Hosp, Dept Surg, Nairobi, Kenya
[4] Univ Nigeria, Teaching Hosp, Dept Radiat Med, Enugu, Nigeria
[5] Rwanda Mil Hosp, Kigali, Rwanda
[6] Dana Farber Canc Inst, Boston, MA 02115 USA