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Competing Interests Agreements

I certify that all forms of support, including drug company support, are acknowledged; any commercial or financial involvements within the past year that might present an appearance of a conflict of interest in connection with the submitted article (e.g., potential conflicts include but are not limited to institutional or corporate affiliations, paid consultancies, stock ownership or other equity interests, patent ownership, royalties, funds for travel, and interests in patents, instruments, and technologies) are disclosed in the cover letter. If the article is accepted for publication, I will consult with the Editor on whether, and to what extent, this information should be included in the published article. In addition, I have not signed an agreement with any sponsor of the study reported in this article that has a clause which prevents me from publishing both positive and negative results, from collaborating with other investigators to pool data across sites, or that forbids me from publishing without the approval of the sponsor.

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