000 00303nam a2200133Ia 4500
008 200512s9999 xx 000 0 und d
082 _a614.5
100 _aFletcher
245 0 _aClinical epidemiology: the essentials
250 _a_
260 _bElsev
_c2005
440 _v_
650 _aepidermology
999 _c47024
_d47024