Decline in the Age of Menarche in Istanbul Schoolgirls Over the Last 12 Years oleh Tülay Güran, Didem Helvacıoğlu, Büşra Gürpınar Tosun, Zehra Yavaş Abalı, Fahriye Alır, Yusuf Taha Arslan, Giasim Molla, Berk Şahin, Mehmet Emir Sayar, Zeynep Atay, Belma Haliloğlu, Korcan Demir, Serap Turan, Seyhan Hıdıroğlu, Abdullah Bereket