1. Division of Health Services Research, Department of Family and Community Medicine, Laura W. Bush Institute for Women's Health, Texas Tech University Health Sciences Center, 3601 4th Street, STOP 8143, Lubbock, TX 79430, USA
2. Family and Community Medicine, TCM Research Program, Center for Integrative Medicine, University of Maryland School of Medicine, East Hall, 520 W. Lombard Street, Baltimore, MD 21201, USA
3. Division of Health Services Research, Department of Health Promotion and Policy, University of Maryland School of Dentistry, and Division of Preventive Medicine, Department of Epidemiology and Public Health, University of Maryland School of Medicine, 650 West Baltimore Street, Room 2213, Baltimore, MD 21201, USA
4. Department of Family and Community Medicine, Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center, 9849 Kenworthy Street, El Paso, TX 79924, USA