@article{article5e39f087,
title   = {Geographic information system and multilevel analysis: gingival status among 12-year-old schoolchildren in São Paulo, Brazil},
author = {Pereira, Stela Márcia and Pardi, Vanessa and Cortellazzi, Karine L and Ambrosano, Gláucia Maria Bovi and Vettorazzi, Carlos Alberto and Ferraz, Silvio Frosini de Barros and Meneghim, Marcelo de Castro and Pereira, Antonio Carlos},
year = {2014},
journal   = {Revista Panamericana de Salud Pública}
}