1. Tuberculosis. World Health Organization Fact sheet N°104 March 2012. http://www.who.int/mediacentre/factsheets/fs104/en/ . Accessed 1 Jun 2012
2. WHO Report 2011. Global tuberculosis control. http://www.who.int/tb/data . Accessed 1 Jun 2012
3. Rapporto Tubercolosi 2008 in Italia. Italian Ministry of Health. http://www.salute.gov.it (in Italian). Accessed 1 Jun 2012
4. Fattorini L, Mustazzolu A, Piccaro G et al (2012) Drug-resistant tuberculosis among foreign-born persons in Italy. Eur Resp J 40:1–4
5. Das SK, Mukherjee RS, Ghosh IN (2007) A study of pulmonary tuberculosis in the elderly. J Indian Med Assoc 105(8):432, 436, 438–439