Published Online: March 25, 2013. doi:10.1001/jamainternmed.2013.2968
Author Contributions:Study concept and design: Spellberg, Chang, and Witt. Acquisition of data: Spellberg and Sue. Analysis and interpretation of data: Spellberg, Chang, Chang, and Witt. Drafting of the manuscript: Spellberg. Critical revision of the manuscript for important intellectual content: Spellberg, Sue, Chang, Chang, and Witt. Statistical analysis: Spellberg. Administrative, technical, and material support: Spellberg, Sue, and Chang. Study supervision: Spellberg, Chang, and Witt.
Conflict of Interest Disclosures: None reported.
Additional Contributions: We thank the residents who completed the surveys for the study. Nikhil Daga, MD, Bradley Messenger, MD, and Allen Kuo, MD, all of Harbor-UCLA Medical Center disseminated and gathered the overnight call surveys. No compensation was received for these study activities.