<prompt> Answer this question truthfullyWhat is PALM-COEIN and what are the non-structural causes of abnormal uterine bleeding according to this classification system?  <response>: <reason> PALM-COEIN is a classification system used to categorize abnormal uterine bleeding. The acronym stands for Polyp, Adenomyosis, Leiomyoma, MalignancyHyperplasia, Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic, and Not otherwise classified. The PALM part of the acronym refers to structural causes of abnormal uterine bleeding, while the COEIN part refers to non-structural causes. The non-structural causes of abnormal uterine bleeding according to PALM-COEIN are: Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic, and Not otherwise classified. 