00305nam a2200109Ia 4500008004100000022001400041040001100055245004000066260006200106300001600168300001100184251112s9999||||xx |||||||||||||| ||und||  a0028-4793  aCNCLSA 4aThe New England Journal of Medicine  cOctober 1, 1998bThe Massachusetts Medical SocietyaU.S.A  aP. 941-2032  bV. 339