. 2015 Apr 13;3(2):e34. doi: 10.2196/mhealth.3928
©Yoshimi Fukuoka, Caryl Gay, William Haskell, Shoshana Arai, Eric Vittinghoff. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 13.04.2015.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mhealth and uhealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.