. 2017 Apr 7;6(4):e54. doi: 10.2196/resprot.7159
©Maryam Rostami, Fahimeh Ramezani Tehrani, Masoumeh Simbar, Farhad Hosseinpanah, Hamid Alavi Majd. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 07.04.2017.
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Figure 3.
Sample estimation formula for the second phase of the study.