Smoking makes Marlboro cowboy 'unfit'.
Ko
J
J
But
D
D
Kwan
M C
MC
Yu
Z
Z
Lam
T H
TH
Leung
G M
GM
D007172:Erectile Dysfunction / Q000209:etiology*; D006801:Humans; D008297:Male; D012907:Smoking / Q000009:adverse effects*