Covid-19 vaccination and menstrual cycle length in the Apple Women's Health Study. - Elizabeth A. Gibson; Huichu Li; Victoria Fruh; Malaika Gabra; Gowtham Asokan; Anne Marie Z. Jukic; Donna D. Baird; Christine L. Curry; Tyler Fischer-Colbrie; Jukka-Pekka Onnela; Michelle A. Williams; Russ Hauser; et al. (npj Digit. Medicine, 2022)