1. Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
2. Cochlear Center for Hearing and Public Health, Johns Hopkins School of University, Baltimore, Maryland
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
4. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
5. Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland