00308nam a2200109Ia 4500008004100000022001400041040001100055245004000066260006900106300001300175300001000188251112s9999||||xx |||||||||||||| ||und||  a0028-4793  aCNCLSA 4aThe New England Journal of Medicine  cjuly-December 28, 1995bThe Massachusetts Medical SocietyaU. K.  aP. 1-888  bV.257