@article{Frenk1989,
author = {Frenk, J. and Bobadilla, J.L. and Sepúlveda, J. and Cervantes, M.L.},
title= {Health transition in middle-income countries: New challenges for health care},
year = {1989},
doi = {10.1093/heapol/4.1.29},
volume = {4},
number = {1},
pages = {29--39},
}