00437nam 2226444 450000100060000000300230000600500090002900800410003808200110007907200230009002000180011310000210013126000160015225000060016824500420017465000230021665000180023926444StarLibrary Marc Built20180430201711 ||||| |||||||||||amh  a614.44 ageneral principles a977-269-156-6 aBrett J. Cassens bmass c1998 a4 apreventive medicine and public health ageneral principles astudy designs