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  1. 1
    GP Prashanth, Design and statistical analysis of observational studies, BJOG: An International Journal of Obstetrics & Gynaecology, 2013, 120, 7
  2. 2
    IM Usta, J Awwad, AH Nassar, Design and statistical analysis of observational studies, BJOG: An International Journal of Obstetrics & Gynaecology, 2013, 120, 7