Massin-Short Sarah B, Grullón Minerva A, Judge Christine M, Ruderman Karen R, Grullón Milagro, Lora Vilma
Harvard School of Public Health, Division of Public Health Practice, Boston, MA 02115, USA.
Public Health Rep. 2010 Sep-Oct;125(5):765-71. doi: 10.1177/003335491012500521.