@article{article9ab819e3,
title   = {Frequency of headache among the employees of a rubber company in the state of São Paulo, Brazil},
author = {Stuginski-Barbosa, Juliana and Speciali, José Geraldo},
year = {2011},
doi = {10.1590/S1516-31802011000200003},
journal   = {São Paulo Medical Journal}
}