[1] Queens Univ, Dept Med, Kingston, ON, Canada
[2] Natl Canc Inst, Maharagama, Sri Lanka
[3] Queens Univ, Oncol, Kingston, ON, Canada
[4] Queens Univ Canc Res Inst, Div Canc Care & Epidemiol, Kingston, ON, Canada
[5] Minist Hlth, Hlth Informat Unit, Colombo, Sri Lanka
[6] Univ Colombo, Fac Med, Dept Surg, Colombo, Sri Lanka