Commentary: stairway to health.
Andersen
Ross
R
Johns Hopkins School of Medicine, 5501 Hopkins Bayview Circle, Suite 1B:84, Baltimore, MD 21224, USA. andersen@jhmi.edu
D002755:Choice Behavior; D004607:Elevators and Escalators; D015438:Health Behavior; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D008019:Life Style; D009043:Motor Activity; D005082:Physical Exertion