Group Information: For more information on the Urologic Diseases in America Project, see
Author Contributions: Study concept and design: Wuerstle, Van Den Eeden, Hollingsworth, and Jacobsen. Acquisition of data: Van Den Eeden, Poon, Quinn, and Jacobsen. Analysis and interpretation of data: Wuerstle, Van Den Eeden, Poon, Quinn, Loo, and Jacobsen. Drafting of the manuscript: Wuerstle, Quinn, Hollingsworth, and Loo. Critical revision of the manuscript for important intellectual content: Wuerstle, Van Den Eeden, Poon, Quinn, and Jacobsen. Statistical analysis: Wuerstle, Poon, and Jacobsen. Obtained funding: Van Den Eeden, Quinn, and Jacobsen. Administrative, technical, and material support: Quinn, Loo, and Jacobsen. Study supervision: Wuerstle, Van Den Eeden, Quinn, Loo, and Jacobsen.
Financial Disclosure: None reported.
Funding/Support: This study was funded in part through a contract sponsored by the National Institute of Health for the Urologic Diseases in America Project contract with the University of California, Los Angeles (Mark S. Litwin, MD, MPH, principal investigator)
Additional Contributions: We thank Bianca Cheung, MS, for the preparation of the manuscript, the staff of the California Men's Health Study for their tireless effort, and the study subjects for their participation in this important study.