Published on in Vol 14, No 1 (2012): Jan-Feb
1 Department of Internal Medicine, The University of Texas Medical School at Houston, Houston, TX, United States
2 Department of Medicine, Penn State College of Medicine, Hershey, PA, United States
3 Department of Family & Community Medicine, Texas A&M Health Science Center College of Medicine, Scott & White Healthcare, Temple, TX, United States
4 Department of Medicine, University of Pittsburgh, Pittsburgh, PA, United States