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. 2013 Feb 13;2(1):e11. doi: 10.2196/resprot.2331

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©Myung Kyung Lee, Hyeoun-Ae Park, Young Ho Yun, Yoon Jung Chang. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 13.02.2013.

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 Research Protocols, is properly cited. The complete bibliographic information, a link to the original publication on http://www.researchprotocols.org, as well as this copyright and license information must be included.

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