00431nam a2200157Ia 450000100060000000800410000602000180004704000130006508200160007810000170009424501000011126000300021130000110024154600070025270000140025920677140408s9999    xx            000 0 und d  a0-340-69153-0  cPK-LaUMT  a 610bDON-D  aAllan Donner  aDesign and analysis of cluster randomization trials in health researchcAllan Donner<>Neil Klar  aLondon,UK:bAronld,c2000  a178 p.  aEN  aNeil Klar