Submitted on: 13 April 2010.
Revised on: 19 May 2010.
Accepted on: 04 June 2010.
SALUD PUBLICA DE MEXICO
Submitted on: 05 May 2022.
Revised on: 03 June 2022.
Accepted on: 29 June 2022.
SALUD PUBLICA DE MEXICO---INST NACIONAL SALUD PUBLICA
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Submitted on: 12 January 2002.
Revised on: 29 January 2002.
Accepted on: 03 February 2002.
SALUD PUBLICA DE MEXICO