Per capita incidence of sexually transmitted infections increases systematically with urban population size: a cross-sectional study
Oscar Patterson-Lomba, Edward Goldstein, Andrés Gómez-Liévano, Carlos Castillo-Chavez, Sherry Towers
Sexually Transmitted Infections Dec 2015, 91 (8) 610-614; DOI: 10.1136/sextrans-2014-051932