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. 2020 Dec 31;9(12):e23830. doi: 10.2196/23830

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©Junko Terada-Hirashima, Manabu Suzuki, Yukari Uemura, Masayuki Hojo, Ayako Mikami, Wataru Sugiura, Norio Ohmagari, Haruhito Sugiyama. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 31.12.2020.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), 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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Sample size calculation. Numbers highlighted in grey represent the sample sizes necessary for detecting effects with a power of 80% in cases where a 25% pneumonia onset control is present.