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Menarcheal age was studied in 900 girls, half of which were from middle class families and the other half from low income class families from the Niger delta region of Nigeria. A retrospective and des...
The aim of the study was an attempt to evaluate the state of health of adolescents aged 15 years, living in Podlasie region near the border of Poland and Bielorus. Data from the Schoolchild Developmen...

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