Gambaran pemeliharaan preventive alat Echocardiography dan Treadmill di Unit Rawat Jalan Rumah Sakit Awal Bros Bekasi tahun 2011 = Description of Echocardiography and Treadmill equipment preventive maintenance system in Inpatient Unit at Awal Bros Hospital Bekasi in 2011 (Fakultas Kesehatan Masyarakat Universitas Indonesia, 2012)