Covid-19 vaccination and menstrual cycle length in the Apple Women’s Health Study This article's authors 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 Brent A. Coull Shruthi Mahalingaiah