เอกสารอ้างอิง

1. Apple Women’s Health Study (September 2023). Menstrual cycle length and variability: a visual explanation. link
2. Bull JR, et al. (2019). Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles. npj Digital Medicine, 2(83). link
3. ACOG Committee Opinion No. 651 (Dec 2015; reaffirmed 2020). Menstruation in Girls and Adolescents: Using the Menstrual Cycle as a Vital Sign. link