Cadmus-Bertram, Lisa Use of the Fitbit to Measure Adherence to a Physical Activity Intervention Among Overweight or Obese, Postmenopausal Women: Self-Monitoring Trajectory During 16 Weeks. [electronic resource] - JMIR mHealth and uHealth Nov 2015 - e96 p. digital Publication Type: Journal Article ISSN: 2291-5222 Standard No.: 10.2196/mhealth.4229 doi