Funding for this research was provided by:
National Institute of Mental Health (U19MH95687)
The National Institute of Child Health and Development (R01 HD075875)
Received: 20 March 2019
Accepted: 8 January 2020
First Online: 15 January 2020
Ethics approval and consent to participate
: This study was approved by institutional review boards at the Human Development Research Foundation (Pakistan), the University of North Carolina at Chapel Hill (United States), and Duke University (United States). Written informed consent was required for study participation and was acknowledged with the participant’s signature or, in the case of illiteracy, by a witness’s signature.
: Not applicable.
: The authors declare that they have no competing interests.