Assessment of quality of primary care with facility surveys: a descriptive analysis in ten low-income and middle-income countries oleh Erlyn K Macarayan, PhD, Anna D Gage, MSc, Svetlana V Doubova, MD, Frederico Guanais, PhD, Ephrem T Lemango, MD, Youssoupha Ndiaye, MD, Peter Waiswa, MD, Margaret E Kruk, MD