title: Adopting new enrollment criteria for pharmaceutical trials in constipation: look before leaping.
authors.affiliation: Division of Gastroenterology and Hepatology, CB 7080, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7080, USA.
authors.forename: William E
authors.initials: WE
authors.lastname: Whitehead
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Chiarioni