What Is the Role of Informal Healthcare Providers in Developing Countries? A Systematic Review Sudhinaraset, May ; Ingram, Matthew ; Lofthouse, Heather Kinlaw ; Montagu, Dominic Abstract Publication: PLoS ONE Pub Date: February 2013 DOI: 10.1371/journal.pone.0054978 Bibcode: 2013PLoSO...854978S