High rates of undiagnosed and untreated osteoporosis in postmenopausal women receiving medical services in the area of Upper Silesia - Hachuła, Marcin; Pietrzyk, Barbara; Gruszka, Wojciech; Cedrych, Ida; Chudek, Jerzy (Menopause Review/Przegląd Menopauzalny, 2020)