Accepted for Publication: March 4, 2013.
Published Online: September 2, 2013. doi:10.1001/jamapediatrics.2013.2361.
Acquisition of data: Araya, Fritsch, Rojas, Martinez, Barroilhet, Vöhringer, Guajardo, Gaete.
Analysis and interpretation of data: Araya, Spears, Martinez, Gunnell, Gaete, Montgomery.
Drafting of the manuscript: Araya, Fritsch, Spears.
Critical revision of the manuscript for important intellectual content: Araya, Fritsch, Rojas, Martinez, Barroilhet, Vöhringer, Gunnell, Stallard, Guajardo, Gaete, Noble, Montgomery.
Statistical analysis: Araya, Fritsch, Spears, Gaete, Montgomery.
Obtained funding: Araya, Fritsch, Rojas, Gunnell, Stallard, Noble, Montgomery.
Administrative, technical, or material support: Araya, Fritsch, Rojas, Martinez, Barroilhet, Vöhringer, Gunnell, Guajardo, Gaete.
Study supervision: Araya, Rojas, Martinez.
Conflict of Interest Disclosures: None reported.
Funding/Support: This project was funded by the Wellcome Trust (project number 082584 Z/07/Z).
Role of the Sponsor: Wellcome Trust had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; in the preparation, review, or approval of the manuscript; or in the decision to submit the manuscript for publication.
Additional Contributions: We thank all the members of the Steering Committee and Data Monitoring and Ethics Committee who made great contributions to the project. Our thanks to all research workers and school staff who contributed to this project; without their hard work and dedication this project would have never been possible.