1. Kramer MS, Kakuma R: The optimal duration of exclusive breastfeeding: a systematic review (WHO/NHD/01.08). 2002, Geneva, Switzerland: World Health Organization
2. Fifty-fourth World Health Assembly (Geneva, 14–17 May 2001). Resolution WHA54.2: Infant and young child nutrition (WHA54.2). 2001, Geneva, Switzerland: World Health Organization, [ http://www.who.int/gb/ebwha/pdf_files/WHA54/ea54r2.pdf ]
3. WHO: The optimal duration of exclusive breastfeeding: report of an expert consultation, Geneva, Switzerland, 28–30 March 2001 (WHO/NHD/01.09). 2002, Geneva, Switzerland: World Health Organization
4. Murray CJ, Ezzati M, Lopez AD, Rodgers A, Vander Hoorn S: Comparative quantification of health risks: conceptual framework and methodological issues. Popul Health Metr. 2003, 1: 1-10.1186/1478-7954-1-1.
5. WHO: Indicators for assessing breast-feeding practices (WHO/CDD/SER/91.14). 1991, Geneva, Switzerland: World Health Organization