Haraldsson S, Roug S, Nøjgaard C, Novovic S, Gluud LL, Feldager E, Schmidt PN.
Department of Gastroenterology, Landspitali - University Hospital, Reykjavik, Iceland. Abdominal Center K, Bispebjerg Hospital, Copenhagen, Denmark. Department of Gastroenterology and Gastrointestinal Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.

Islamoglu E, Tas S, Karamik K, Yalcinkaya S, Tokgoz H, Savas M
University of Health Sciences, Antalya Training and Research Hospital, Antalya, Turkey.

Bianchi G, Marega D, Knez R, Bucci S, Trombetta C.
Department of Urology, University of Trieste, Cattinara Hospital, Trieste.

Department of Gastroenterology, Gongli Hospital.Changhai Hospital, The Second Military Medical University, Shanghai.
Hainan Branch of Chinese PLA General Hospital, Sanya.
Digestive Endoscopy Center, Changhai Hospital, The Second Military Medical University, Shanghai.
Department of Gastroenterology, The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, Guangdong, China

Tang QL, Zhou S, Jia CP, Lv JL.

Department of Urology, The Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing, 211100, Jiangsu, China.