Additional file 3: of Habit training versus habit training with direct visual biofeedback in adults with chronic constipation: study protocol for a randomised controlled trial NortonChristine EmmanuelAnton StevensNatasha ScottS. GrossiUgo BannisterSybil EldridgeSandra MasonJames KnowlesCharles 2017 Consent form for interviews. (DOCX 48 kb)