Selection biases in semen study?
Skakkebaek
N E
NE
Giwercman
A
A
Jensen
T K
TK
Carlsen
E
E
Jørgensen
N
N
Keiding
N
N
D000328:Adult; D003718:Denmark; D006801:Humans; D008297:Male; D010560:Personnel Selection; D012661:Semen / Q000502:physiology*; D013076:Sperm Count