1. Department of Medicine Johns Hopkins University School of Medicine Baltimore Maryland
2. Whiting School of Engineering Johns Hopkins University Baltimore Maryland
3. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore Maryland
4. Feinberg School of Medicine, Northwestern University Division of Rheumatology Chicago Illinois
5. Department of Medicine and Department of Neurology Johns Hopkins University School of Medicine, Baltimore, Maryland, and Muscle Disease Unit, National Institute of Musculoskeletal and Skin Diseases, NIH Bethesda Maryland
6. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health, and Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Baltimore Maryland