Additional file 1: of Open-label versus double-blind placebo treatment in irritable bowel syndrome: study protocol for a randomized controlled trial BallouSarah KaptchukTed HirschWilliam NeeJudy IturrinoJohanna HallKathryn M. KelleyJohn ChengVivian KirschIrving JacobsonEric ConboyLisa LemboAnthony DavisRoger 2017 SPIRIT 2013 Checklist. (DOC 121 kb)