H. L. Ratcliffe,D. Schwarz,L. R. Hirschhorn,C. Cejas,A. Diallo,E. Garcia-Elorrio,J. Fifield,D. Gashumba,L. Hartshorn,N. Leydon,M. Mohamed,Y. Nakamura,Y. Ndiaye,J. Novignon,A. Ofosu,S. Roder-DeWan,A. Rwiyereka,F. Secci,J. H. Veillard and A. Bitton. PHC Progression Model: a novel mixed-methods tool for measuring primary health care system capacity. BMJ Glob Health. 2019;4(5):10.1136/bmjgh-2019-001822.