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Clinical, biochemical and radiological factors that may aid the clinician in distinguishing functional hypothalamic amenorrhoea (FHA) and polycystic ovarian syndrome (PCOS) in women with secondary oligo/amenorrhoea. OGTT, oral glucose tolerance test; CRH, corticotrophin‐releasing hormone; AMH, anti‐Müllerian Hormone; SHBG, sex hormone binding globulin; LH, luteinising hormone; BMI, body mass index
