00407nas a2200145   4500000000100000000000100001008004100002100001300043700001200056700001200068245014800080300001100228490000800239022001400247       2002                            d1 aC. Black1 aJ. Kaye1 aH. Jick00aRelation of childhood gastrointestinal disorders to autism: nested case-control study using data from the UK General Practice Research Database  a419-210 v325  a0959-8138