WALTHAM, Mass.--(BUSINESS WIRE)--Fresenius Medical Care (NYSE: FMS), the world’s largest provider of dialysis products and services, announced that Franklin W. Maddux, M.D., FACP, has been appointed Chief Medical Officer (CMO) for Fresenius Medical Care North America (FMCNA), effective December 12, 2011. In this role he will also be responsible for Clinical and Scientific Affairs.