1. Department of Psychology; St. Jude Children's Research Hospital; Memphis; TN; USA
2. Department of Biostatistics; St. Jude Children's Research Hospital; Memphis; TN; USA
3. Center for Behavioral Epidemiology and Community Health; San Diego State University; San Diego; CA; USA
4. University of Arkansas for Medical Sciences; Little Rock; AR; USA
5. Department of Epidemiology and Cancer Control; St. Jude Children's Research Hospital; Memphis; TN; USA
6. Department of Oncology; St. Jude Children's Research Hospital; Memphis; TN; USA