[1] Humanitas Univ, Dept Biomed Sci, Pieve Emanuele, Italy
[2] IRCCS, Endoscopy Unit, Humanitas Clin & Res Ctr, Rozzano, Italy
[3] Univ Oslo, Clin Effectiveness Res Grp, Oslo, Norway
[4] Showa Univ, Ctr Digest Dis, Northern Yokohama Hosp, Yokohama, Kanagawa, Japan
[5] Univ Kansas, Sch Med, Kansas City, KS USA
[6] VA Med Ctr, Kansas City, KS USA