Analisis hambatan keikutsertaan Metode Kontrasepsi Jangka Panjang di Kecamatan Semparuk, Kabupaten Sambas, Kalimantan Barat Tahun 2019 = Analysis of obstacles to participation in Long-Term Contraceptive Methods in Semparuk Sub-district, Sambas District, West Kalimantan, 2019.