NEW YORK–(BUSINESS WIRE)–Perimenopause can be difficult to recognize. Unlike menopause, which is defined by the absence of a menstrual period for 12 consecutive months, perimenopause is a transition that can unfold over several years, with symptoms varying significantly from woman to woman. In fact, one in three U.S. women ages 35 and older are unsure whether they’re in perimenopause, according to new research from The Menopause Society, with 28% citing a lack of knowledge as a key reason for