Geographic barriers to achieving universal health coverage: evidence from rural Madagascar. - Garchitorena A; Ihantamalala FA; Révillion C; Cordier LF; Randriamihaja M; Razafinjato B; Rafenoarivamalala FH; Finnegan KE; Andrianirinarison JC; Rakotonirina J; Herbreteau V; Bonds MH (Health policy and planning, 2021)