[1] Colombo South Teaching Hosp, Univ Med Unit, Kalubowila, Sri Lanka
[2] Univ Sri Jayewardenepura, Fac Med Sci, Dept Surg, Nugegoda, Sri Lanka
[3] Univ Colombo, Fac Med, Dept Surg, Colombo, Sri Lanka
[4] Univ Sri Jayewardenepura, Fac Med Sci, Dept Med, Nugegoda, Sri Lanka
[5] Colombo South Teaching Hosp, Univ Med Unit, Hosp Rd, Kalubowila 10350, Dehiwala, Sri Lanka