This paper is in the following e-collection/theme issue:

Mobile Health (mhealth) 

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Works citing "Estimation of Physical Activity Levels Using Cell Phone Questionnaires: A Comparison With Accelerometry for Evaluation of Between-Subject and Within-Subject Variations"

Christin Bexelius, Sven Sandin, Ylva Trolle Lagerros, Jan-Eric Litton, Marie Löf
J Med Internet Res 2011 (Sep 25); 13(3):e70 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.1686):

(note that this is only a small subset of citations)

1. Azevedo ARP, de Sousa HML, Monteiro JAF, Lima ARNP. Future perspectives of Smartphone applications for rheumatic diseases self-management. Rheumatology International 2014; [CrossRef]
2. W.Seidel R, Pardo K, A.Estabrooks P, WenYou E, Wall S, M.Davy B, A.Almeida F. Beginning A Patient-Centered Approach in the Design of A Diabetes Prevention Program. International Journal of Environmental Research and Public Health 2014;11(2):2003 [CrossRef]
3. Pfaeffli L, Maddison R, Jiang Y, Dalleck L, Löf M. Measuring Physical Activity in a Cardiac Rehabilitation Population Using a Smartphone-Based Questionnaire. Journal of Medical Internet Research 2013;15(3):e61 [CrossRef]
4. Lagerros YT, Sandin S, Bexelius C, Litton J, Löf M. Estimating physical activity using a cell phone questionnaire sent by means of short message service (SMS): a randomized population-based study. European Journal of Epidemiology 2012;27(7):561 [CrossRef]