[1] Cleveland Clin, Digest Dis Surg Inst, Dept Colorectal Surg, Cleveland, OH 44195 USA
[2] Wake Forest Univ, Baptist Med Ctr, Dept Surg, Winston Salem, NC 27101 USA
[3] Mt Sinai Hosp, Dept Surg, Toronto, ON, Canada
[4] Zane Cohen Ctr Digest Dis, Toronto, ON, Canada
[5] Univ Toronto, Dept Surg, Toronto, ON, Canada
[6] Univ Catanzaro, Dept Med & Surg Sci, Catanzaro, Italy
[7] St Marks Hosp & Acad Inst, Fistula Res Unit, London, England
[8] Cedars Sinai, Dept Surg, Los Angeles, CA USA
[9] Univ Parana PUCPR, IBD Outpatient Clin, Colorectal Surg Unit, Curitiba, Parana, Brazil
[10] Colon & Rectal Surg Unit, Humanitas Clin & Res Ctr, Rome, Italy
[11] Humanitas Univ, Dept Biomed Sci, Rome, Italy
[12] Northwestern Univ, Dept Gastrointestinal Surg, Chicago, IL 60611 USA
[13] Yokkaichi Hazu Med Ctr, Inflammatory Bowel Dis Ctr, Yokaichi, Japan
[14] Yokkaichi Hazu Med Ctr, Dept Surg, Yokaichi, Japan