This OHCHR, UNFPA, UNICEF, UN Women and WHO joint interagency statement reaffirms the commitment of United Nations agencies to encourage and support efforts by States, international and national organizations, civil society and communities to uphold the rights of girls and women and to address the multiple manifestations of gender discrimination including the problem of imbalanced sex ratios caused by sex selection. It thus seeks to highlight the public health and human rights dimensions and implications of the problem and to provide recommendations on how best to take effective action. (...)

A Joint Statement by OHCHR, UNFPA, UNICEF, UN Women and WHO:
http://www.ohchr.org/EN/NewsEvents/Pages/DisplayNews.aspx?NewsID=11144&LangID=E

The publication:
http://whqlibdoc.who.int/publications/2011/9789241501460_eng.pdf