Ecological analyses and the evaluation of needle and syringe programmes
Received 1 December 2002; received in revised form 15 March 2003; accepted 2 July 2003.
No abstract is available. To read the body of this article, please view the Full Text online.
Department of Preventive and Social Medicine, School of Medicine, Federal University of Minas Gerais (UFMG), Av. Alfredo Balena 190 10o. andar, MG 30130-100 Belo Horizonte, Brazil
