2006k-769 2008f-508 2012b-266 adolescent child complications diagnosis digestiveorgans digestivesystemdiseases diseases gastrointestinaldiseases gastrointestinalsystem infant infantnutritionalphysiologicalphenomena intestinaldiseases intestines liver liverdiseases malabsorptionsyndromes med031000med060000med078000 med069000 medical newborn newborninfants pathology pediatrics physiopathology problems psychosomaticaspects somatoformdisordersinchildren surgery therapy treatment wi400 ws18l716p1985 ws310g25552008 ws310l7841994 ws310l7842014 ws310p371412006 ws310p371412016