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Structure for the Rural health Infastucture consists of 4 levels -- District Hospitals (DH), Community Health Centers (CHC), Primary Health Centers (PHC), and Sub-Centers (SC). The number of Sub-Centers (SCs) refers to public facilities. The number of Sub-Centers (SCs) refer to public facilities under the National Rural Health Mission (NRHM) and the National Urban Health Mission (NUHM) (see original source)