Hubungan Kadar Serum 25-hydroxyvitamin D dan Sun Index (Indeks Pajanan Matahari) dengan Jumlah dan Ukuran Lesi Keratosis Seboroik pada Wajah di Poliklinik Kulit dan Kelamin, RSUPN Dr. Cipto Mangunkusumo = The Correlation between 25-hydroxyvitamin D Level and Sun Index with Number and Size of Seborrheic Keratoses Lesions on The Face in Dermatovenereology Clinic, Dr. Cipto Mangunkusumo National General Hospital