Perbandingan pola kasus rujukan rawat jalan sebelum dan sesudah pelaksanaan program JKN di Poliklinik Obstetri dan Ginekologi RSUPN Dr. Cipto Mangunkusumo = Comparison of patterns of outpatient referral cases before and after implementation of National Health Coverage Program in Dr. Cipto Mangunkusumo General Hospital / Arresta Vitasatria Suastika