Herve S, Leroi AM, Mathiex-Fortunet H, Garnier P, Karoui S, Menard JF, Ducrotte P, Denis P. Effects of polyethylene glycol 4000 on 24-h manometric recordings of left colonic motor activity. European Journal of Gastroenterology & Hepatology. 2001 Jun;13(6):647–54. doi: 10.1097/00042737-200106000-00006.