เอกสารอ้างอิง:
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(2). Curtis KM, Jatlaoui TC, Tepper NK, Zapata LB, Horton LG, Jamieson DJ, et al. U.S. Selected Practice Recommendations for Contraceptive Use, 2016. MMWR Recommendations and Reports [Internet]. 2016 Jul 29;65(4):1–66.
(3). Alison E, Bliss K. Evaluation of unscheduled bleeding in individuals using hormonal contraception. In: Post TW, ed. Uptodate. Waltham: Uptodate; 2023. (Accessed on November 28, 2023.)