RT Journal Article SR Electronic T1 Lactobacillus rhamnosus GG reduces frequency and severity of abdominal pain compared with placebo in children with irritable bowel syndrome JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 141 OP 142 DO 10.1136/ebm1199 VO 16 IS 5 A1 Markus A Rose YR 2011 UL http://ebm.bmj.com/content/16/5/141.abstract AB