Authors: David Gathara; Newton Opiyo; John Wagai; Stephen Ntoburi; Philip Ayieko; Charles Opondo; Annah Wamae; Santau Migiro; Wycliffe Mogoa; Aggrey Wasunna; Fred Were; Grace Irimu; Mike English Journal: BMC Health Serv Res Date: 2011-11-11 Impact factor: 2.655