00321nam a2200109Ia 450000500170000000800410001702000180005805000230007610000140009924500490011326000490016220260811030736.0260811s9999    xx            000 0 und d  a0 521 83261 6  aR 733.7 .M396 2004  aMayer, D. 0aEssential evidence based medicine.cD. Mayer  aCambridge:bCambridge university pressc2004