Effective coverage measurement in maternal, newborn, child, and adolescent health and nutrition: progress, future prospects, and implications for quality health systems oleh Andrew D Marsh, PhD, Moise Muzigaba, PhD, Theresa Diaz, MD, Jennifer Requejo, PhD, Debra Jackson, ProfDSc, Doris Chou, MD, Jenny A Cresswell, PhD, Regina Guthold, PhD, Allisyn C Moran, PhD, Kathleen L Strong, PhD, Anshu Banerjee, PhD, Agnès Soucat, PhD