1. Global data on visual impairment the year 2002;Resnikoff;Bull World Health Organ,2004
2. Prevalence of trachoma in Brazil [in Portuguese];De Freitas;Rev Bras Malariol Doencas Trop,1976
3. Hyperendemic focus of trachoma: current status [in Portuguese];de Freitas;Rev Bras Malariol Doencas Trop,1977
4. Trachoma: the epidemiological and control aspects [in Portuguese];Vieira;Rev Soc Bras Med Trop,1998
5. Trachoma: current epidemiological status in Brazil;Lopes,2008