Authorship of a manuscript for biostatisticians (and others) is appropriate when the biostatistician has made a contribution to the work described in the manuscript and when the biostatistician has contributed to the manuscript, including writing a statistical methods section, providing statistical results, or reviewing it for correctness. The appropriateness of authorship is not related to whether the biostatistician has been compensated, just as it is not related to authorship for principal investigators or other co-investigators. See the following link for further information. Please note that omission of an author who meets the requirements of this policy is considered to be a violation of standard research ethics.

 International Committee of Medical Journal Editors
“Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals” (PDF) 

Citing the Grant

Investigators are required to cite the CTSC grant in publications that result from studies that received support from any CTSC resource.  Publications that have cited the CTSC grant must also be made publicly available on
PubMed Central and have a valid PubMed Central ID (PMCID).

Further details can be found here.