Human Reproduction · 2014 · 137 citations · 42 references
All funding sources were non-profitable and sponsors of this study played no role in the study design, in data collection, analysis, or interpretation, or in the writing of the article. The authors have no conflicts of interest.
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Regional differences in semen quality in Europe
Niels Jørgensen, Anne-Grethe Andersen, Florence Eustache et al. · Human Reproduction · 2001 · 449 citations
Fertility, Reproductive Health, General Seasonal Variation +16
Semen quality of male smokers and nonsmokers in infertile couples
Robert Künzle, Michael D. Mueller, W. Hänggi et al. · Fertility and Sterility · 2003 · 397 citations