Health system and patient-level factors serving as facilitators and barriers to rheumatic heart disease care in Sudan oleh Jeffrey G. Edwards, Michele Barry, Dary Essam, Mohammed Elsayed, Mohamed Abdulkarim, Basamat M. A. Elhossein, Zahia H. A. Mohammed, Abdelmunim Elnogomi, Amna S. E. Elfaki, Ahmed Elsayed, Andrew Y. Chang