Hubungan prostat spesifik antigen volume prostat dan protrusi prostat intravesika untuk memprediksi derajat obstruksi akibat pembesaran prostat di rumah sakit Sardjito = Relationship between prostate spesific antigen prostate volume and intravesical prostatic protrusion in detecting bladder outlet obstruction caused by prostate enlargement at Sardjito hospital Yogyakarta / Indra Cahya Kurnia