1. Department of Surgery, Olabisi Onabanjo University Teaching Hospital, Sagamu, Ogun State, Nigeria
2. Department of General Surgery, Southend University Hospital, Westcliff on Sea, Essex, UK
3. Department of Surgery, Colorectal and Pelvic Floor Unit, Southend University Hospital, Westcliff on Sea, Essex, UK (Part of Mid- and South Essex NHS Foundation Trust)
4. Department of Surgery, College of Medicine, University of Lagos, Lagos, Nigeria