“…60 , 63 Six of the studies were case-control studies, of which half were matched case control studies, 49 , 53 , 58 and the other half were unmatched case control studies 51 , 54 , 60 ; 3 studies were cross-sectional 57 , 64 , 65 ; 2 studies were cohort studies, 1 of which was prospective, 59 the other retrospective 55 ; 1 study was qualitative phenomenology 62 ; and for 4 studies, a clear study design was not reported. 50 , 52 , 56 , 61 The studies were carried out in Addis Ababa City (ie, on patients from Tikur Anbessa Specialized Hospital (TASH), 52 - 55 , 59 , 63 - 65 Mexico Higher Clinic (MHC), 53 , 54 the Adera Higher Clinic (AHC), 51 , 53 , 54 6 health facilities from Addis Ababa, 60 and Addis Ababa Cancer Registry (AACR) (three governmental hospitals and 12 private facilities submitted cancer cases) 61 ) (64.71%), 51 - 55 , 59 - 61 , 63 - 65 Yirga Alem (on patients from Sidama Regional Hospital) (5.88%), 50 Arsi zone (patients from Asella Teaching and Referral Hospital and others) (23.53%), 49 , 57 , 58 , 62 and 10 referral hospitals f...…”