[¹⁸F]FDG uptake in axillary lymph nodes and deltoid muscle after COVID-19 mRNA vaccination: a cohort study to determine incidence and contributing factors using a multivariate analysis.

"Declarations Conflict of interestKiichi Ishiwata (Fukushima Medical University) has received an endowment from the Southern TOHOKU Research Institute for Neuroscience. The other authors have no conflicts of interest related to this article. Conflict of interest Kiichi Ishiwata (Fukushima Medical University) has received an endowment from the Southern TOHOKU Research Institute for Neuroscience. The other authors have no conflicts of interest related to this article."

"We would like to thank Dr. Ukihide Tateishi, Dr. Kazuyoshi Akiyama, Dr. Shinichiro Kumita, Dr. Noboru Oriuchi, and Dr. Tohru Shiga for their contributions to the interpretations of the FDG-PET/CT images. We would also like to thank the nurses, radiology technologists, and receptionists in our PET center for their excellent contributions to the interviews and the performance of the FDG-PET/CT examinations. A part of this study was supported by JSPS KAKENHI Grant Number JP19H03608 (TS and KI). Declarations: Conflict of interestKiichi Ishiwata (Fukushima Medical University) has received an endowment from the Southern TOHOKU Research Institute for Neuroscience. The other authors have no conflicts of interest related to this article."