Key points are not available for this paper at this time.
aDepartment of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan bDepartment of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA cOkayama University of Science, Japan Sources of Funding: ES is supported by the Japan Society for the Promotion of Science (JSPS KAKENHI Grant Numbers JP19KK0418 and JP23K09740). The funding sources had no involvement in study design; the collection, analysis, and interpretation of data; the writing of the article; and the decision to submit the article for publication. Conflicts of Interest: None declared. Data Availability: Not applicable because this is a theoretical paper without data analysis. Acknowledgments: None. To the Editor: Corresponding author: Etsuji Suzuki, Department of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan. Telephone: +81-86-235-7174. Email: email protected
Suzuki et al. (Mon,) studied this question.
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