1. Master of Hospital Administration, Universitas Muhammadiyah Yogyakarta, Yogyakarta 55183, Indonesia
2. Department of Child Health, Faculty of Medicine Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60285, Indonesia
3. Department of Cardiology and Vascular Medicine, Faculty of Medicine Universitas Airlangga, Dr. Soetomo General Hospital, Surabaya 60285, Indonesia