Pemanfaatan program jaminan persalinan berdasarkan karakteristik ibu di wilayah puskesmas Pauh Kambar Kecamatan Nan Sabaris Kabupaten Padang Pariaman tahun 2012 = Utilization of Labor Assurance program based on mother?s characteristic at Pauh Kambar Health Center, Nan Sabaris Sub-district, Padang Pariaman District, 2012