- Correspondence to Professor Michael G Sarr, Emeritus J C Masson Professor of Surgery, Department of Surgery, Mayo Clinic, 200 1st St SW, Mayo Clinic (GU 10-01), Rochester, MN 55902, USA;
- Received 24 July 2017
- Revised 8 June 2017
- Accepted 25 July 2017
- Published online 10 August 2017.
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