00277nam a2200097Ia 4500008004100000040001100041245004000052260006000092300001600152300001100168251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 4aThe New England Journal of Medicine  cMarch 2, 1995bThe Massachusetts Medical SocietyaU.S.A  aP. 557-1166  bV. 374