World Health Organization. World Health Assembly A62/7. Provisional agenda item 12.3; 2 April 2009. Prevention of avoidable blindness and visual impairment. Geneva: WHO Press; 2009: 1-15 Im Internet (Stand: 26.11.2019): https://apps.who.int/gb/ebwha/pdf_files/A62/A62_7-en.pdf
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