Submitted on: 22 June 2004.
Revised on: 31 July 2004.
Accepted on: 20 August 2004.
Lancet Public Health
Submitted on: 27 May 2023.
Revised on: 25 June 2023.
Accepted on: 07 July 2023.
Lancet Public Health---ELSEVIER SCI LTD
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Submitted on: 11 May 2020.
Revised on: 06 June 2020.
Accepted on: 26 June 2020.
Lancet Public Health