Safety of simultaneous vaccination with COVID-19 vaccines in the Vaccine Safety Datalink.

"appendix a supplementary material the following are the supplementary data to this article: supplementary data 1 data availability the authors do not have permission to share data."

"Conflict of interest disclosures KEH reports research support from Seqirus for unrelated studies. NPK reports research support from Pfizer for COVID vaccine clinical trials and from Merck, Pfizer, GlaxoSmithKline and Sanofi Pasteur for unrelated studies. WKY has received research funding from Pfizer in the past. All other co-authors have no conflicts of interest to report. Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Kayla E. Hanson reports a relationship with Seqirus that includes: funding grants. Nicola P. Klein reports a relationship with Pfizer that includes: funding grants. Nicola P. Klein reports a relationship with Merck & Co Inc that includes: funding grants. Nicola P. Klein reports a relationship with GlaxoSmithKline that includes: funding grants. Nicola P. Klein reports a relationship with Sanofi Pasteur that includes: funding grants. W. Katherine Yih reports a relationship with Pfizer that includes: funding grants."

"Funding/support This work was supported by the Centers for Disease Control and Prevention (CDC). This activity was reviewed by CDC and was conducted consistent with applicable federal law and CDC policy. See, for example, 45 C.F.R. part 46.102(l)(2), 21 C.F.R. part 56; 42 U.S.C. §241(d); 5 U.S.C. §552a; 44 U.S.C. §3501 et seq."