2013 – Assessing the internal and external validity of mobile health physical activity promotion interventions: a systematic literature review using the RE-AIM framework.

2013 Blackman KC, Zoellner J, Berrey LM, Alexander R, Fanning J, Hill JL, Estabrooks PA. Assessing the internal and external validity of mobile health physical activity promotion interventions: a systematic literature review using the RE-AIM framework. J Med Internet Res. 2013 Oct 4;15(10):e224. doi: 10.2196/jmir.2745. 24095951