1. Center for Biostatistics in AIDS Research, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
2. The conclusions and opinions expressed in this article are those of the authors and do not necessarily reflect those of the National Institutes of Health or US Department of Health and Human Services.
3. Psychiatry and Behavioral Science, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
4. Department of Pediatrics, University of Illinois at Chicago Children's Hospital, Chicago, Illinois, USA.
5. Department of Communication Sciences and Disorders, University of Utah, Salt Lake City, Utah, USA.
6. Child Language Doctoral Program, Department of Speech, Language and Hearing, University of Kansas, Lawrence, Kansas, USA.
7. Maternal, Child and Adolescent Program for Infectious Diseases and Virology, Department of Pediatrics, Keck School of Medicine of University of Southern California, Los Angeles, California, USA.
8. School of Speech, Language and Hearing Sciences, San Diego State University, San Diego, California, USA.
9. Department of Psychiatry, HIV Center for Clinical and Behavioral Studies, New York State Psychiatric Institute and Columbia University Irving Medical Center, New York, New York, USA.
10. Epidemiology and Statistics Program, National Institute on Deafness and Other Communication Disorders, NIH, Bethesda, Maryland, USA.
11. Department of Biostatistics and Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
12. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.