TY - JOUR A1 - Frenk, J. A1 - Bobadilla, J.L. A1 - Stern, C. A1 - Frejka, T. A1 - Lozano, R. T1 - Elements for a theory of the health transition Y1 - 1991 JF - Health Transition Review VL - 1 IS - 1 SP - 21 EP - -38 ER -