Accepted for Publication: November 27, 2014.
Published Online: February 11, 2015. doi:10.1001/jamadermatol.2014.5263.
Study concept and design: Cai, Tan, Tang.
Acquisition, analysis and interpretation of data: All authors.
Drafting of the manuscript: Cai.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Cai, Allen.
Administrative, technical, or material support: Allen, Lim, Tan, Tang.
Study supervision: Lim, Tang.
Conflict of Interest Disclosures: None reported.
Additional Contributions: We thank our colleagues and nurses, especially those in the Immunobullous Clinic, National Skin Centre, for their expert care in treating our patients. We also thank the team from the National Registry of Diseases Office for their invaluable help and support in providing the cancer and mortality data for this study and enabling us to conduct the data analysis at their premises. None received compensation.