Improving the Quality of Dietary Research 

David S. Ludwig, MD, PhD; Cara B. Ebbeling, PhD; Steven B. Heymsfield, MD

Viewpoint: The Challenge of Reforming Nutritional Epidemiologic Research ; John P. A. Ioannidis, MD, DSc

Viewpoint: Current and Future Landscape of Nutritional Epidemiologic Research; Frank B. Hu, MD, PhD; Walter C. Willett, MD, DrPH

A Professional Standard for Informed Consent for Stem Cell Therapies

Jeremy Sugarman, MD, MPH, MA; Roger A. Barker, MRCP, PhD; R. Alta Charo, JD

Medical News & Perspectives: Unproven but Profitable: The Boom in US Stem Cell Clinics; Rita Rubin, MA

Research Letter: Scope and Training of Clinicians Providing Unproven Stem Cell Interventions; Wayne Fu, MD, MBA; Cambray Smith, BS; Leigh Turner, PhD; Joseph Fojtik, MD; Joel E. Pacyna, MA; Zubin Master, PhD