1. Department of Gastroenterology, Shandong Provincial Third Hospital, Shandong University, Jinan, People’s Republic of China
2. Department of Anatomy, Faculty of Basic Medical Sciences, College of Health Sciences, Nnamdi Azikiwe University, Nnewi, Nigeria
3. Department of Obstetrics and Gynaecology, College of Medicine, University of Ibadan, Ibadan, Nigeria
4. Pan African University of Life and Earth Science Institute (Including Health and Agriculture), PAULESI, University of Ibadan, Ibadan, Nigeria