Pain prevalence and chronicity in a developing country in Latin America: a population-based survey in Lima, Peru von Leyva, Enrique Orrillo, Bockos, Ian Falvy, Vela Barba, Carlos L, Aldazabal, Daniel Arbaiza, Vitorino, Carolina Estrada, García-Mostajo, Jorge A, Atauje, Héctor Valderrama, Rojas-Cama, Luis F, Soto-Becerra, Percy

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