RT Journal Article SR Electronic T1 Slow transit constipation: more than one disease? JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 610 OP 610 DO 10.1136/gut.51.4.610 VO 51 IS 4 A1 C Pehl A1 T Schmidt A1 W Schepp YR 2002 UL http://gut.bmj.com/content/51/4/610.abstract AB