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Paasch U, Salzbrunn A, Glander HJ, Plambeck K, Salzbrunn H, Grunewald S, Stucke J, Vierula M, Skakkebaek NE, Jorgensen N: Semen quality in sub- fertile range for a significant proportion of young men from the general German population: a co-ordinated, controlled study of 791 men from Hamburg and Leipzig. Int J Androl 2008, 31(2):93-102. Pre-publication history The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1471-2458/10/24/prepub doi: 10.1186/1471-2458-10-24 Cite this article as: Merzenich et al, Decreasing sperm quality: a global prob- lem? BMC Public Health 2010, 10:24