A note about manuscript authorship
The Uniform Requirements for Manuscripts Submitted to Biomedical Journals are very clear about who should and should not be a manuscript author.
Here are their criteria:
"Authorship credit should be based on
1) substantial contributions to conception and design, or acquisition of data, or analysis and interpretation of data;
2) drafting the article or revising it critically for important intellectual content; and
3) final approval of the version to be published. Authors should meet conditions 1, 2, and 3."
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As tempting as it may be to include everyone who assisted with data entry and subject recruitment in authorship, if they haven't also assisted with the design, analysis, or writing, then you are not doing yourself (or them) any favors by including them.
Also, after about the fourth author? The journal editors are going to become suspicious of the contributions of the additional authors.