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. 2021 Apr 22;5(3):e140. doi: 10.1097/EE9.0000000000000140

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Copyright © 2021 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of The Environmental Epidemiology. All rights reserved.

Written work prepared by employees of the Federal Government as part of their official duties is, under the U.S. Copyright Act, a "work of the United States Government" for which copyright protection under Title 17 of the United States Code is not available. As such, copyright does not extend to the contributions of employees of the Federal Government.

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Figure 1. — Flow diagram showing exclusion criteria and numbers of JHS participants in each analysis. Participants could be excluded for more than one reason.