Kapasitas Difusi Paru (DLCO) pada Pasien Tumpang Tindi Asma - Penyakit Paru Obstruktif Kronik di Rumah Sakit Umum Pusat Persahabatan Jakarta = Diffusing Capacity (DLCO) on Patient with Asthma - Chronic Obstructive Pulmonary Disease Overlap in Persahabatan Hospital, Jakarta