00375nas a2200157   4500000000100000000000100001008004100002100001400043700001200057700001200069700001200081245009200093300001100185490000700196022001400203       2004                            d1 aM. Hernan1 aS. Jick1 aM. Olek1 aH. Jick00aRecombinant hepatitis B vaccine and the risk of multiple sclerosis: a prospective study  a838-420 v63  a0028-3878