Editorial
Declining sperm counts
D M de Kretser

Is the human testis still an organ at risk?
Stewart Irvine

Abstract
Evidence of deteriorating semen quality in the United Kingdom: birth cohort study in 577 men in Scotland over 11 years
Stewart Irvine, Elizabeth Cawood, David Richardson Eileen MacDonald, John Aitken

Time series analysis of sperm concentration in fertile men in Toulouse, France between 1977 and 1992
L Bujan, A Mansat, F Pontonnier, R Mieusset

Incidence of disorders of spermatogenesis in middle aged Finnish men, 1981-91: two necropsy series
Jarkko Pajarinen, Pekka Laippala, Antti Penttila, Pekka J Karhunen

Risk of testicular cancer in cohort of boys with cryptorchidism
A J Swerdlow, C D Higgins, M C Pike

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