Nugroho, R. Haryo, Bhisma Murti, and Arif Suryono. 2019. “Disparity in Health Care Utilization by Income Level and Insurance Status at Gamping Muhammadiyah Hospital, Yogyakarta, Indonesia”. Journal of Health Policy and Management 4 (3):195-203. http://thejhpm.com/index.php/thejhpm/article/view/141.