@article{article7258fdd1,
title   = {Semen analysis in fertile patients undergoing vasectomy: reference values and variations according to age, length of sexual abstinence, seasonality, smoking habits and caffeine intake},
author = {Sobreiro, Bernardo Passos and Lucon, Antonio Marmo and Pasqualotto, Fábio Firmbach and Hallak, Jorge and Athayde, Kelly silveira and Arap, Sami},
year = {2005},
doi = {10.1590/s1516-31802005000400002},
journal   = {São Paulo Medical Journal}
}