Author Contributions: Dr Zirakzadeh had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Paras, Murad, Chen, Colbenson, Elamin, Seime, Zirakzadeh.
Acquisition of data: Paras, Chen, Goranson, Sattler, Colbenson, Prokop, Zirakzadeh.
Analysis and interpretation of data: Paras, Murad, Chen, Elamin, Seime, Zirakzadeh.
Drafting of the manuscript: Paras, Murad, Chen, Prokop, Seime, Zirakzadeh.
Critical revision of the manuscript for important intellectual content: Paras, Murad, Chen, Goranson, Sattler, Colbenson, Elamin, Seime, Zirakzadeh.
Statistical analysis: Murad, Elamin, Zirakzadeh.
Administrative, technical, or material support: Paras, Murad, Chen, Elamin, Zirakzadeh.
Study supervision: Elamin, Seime, Zirakzadeh.
Financial Disclosures: None reported.
Additional Contributions: We thank the Mayo Clinic library staff for their assistance in obtaining the many manuscripts needed to complete this study and also Anne Safley, MD, of University of Iowa Hospitals and Clinics for critical review of the manuscript. We would also like to extend our gratitude to Mary-Ann Fitzcharles, MB, ChB, and Sarah Romans, MD, who returned original data on request.