References
- Auger J, Kunstmann JM, Cyglik F, Jouannet P (1995): Decline in semen quality among fertile men in Paris during the past years. N Engl J Med 332:281–285.
- Bahamondes L, Abdelmassih R, Dachs IN (1979): Survey of 185 sperm analysis of fertile men in an infertility service. Int J Androl 2:526–533.
- Becker S, Berhane K (1997): A meta-analysis of 61 sperm count studies revisited. Fertil Steril 67:1103–1108.
- Bendvold E (1989): Semen quality in Norwegian men over a 20-year period. Int J Fertil 34:401–404.
- Bendvold E, Gottlieb C, Bygdeman M, Eneroth P (1991): Depressed semen quality in Swedish men from barren couples: a study over three decades. Arch Androl 26:189–194.
- Bromwich P, Cohen J, Stewart I, Walker A (1994): Decline in sperm counts: an artefact of changed reference range of "normal"? BMJ 309:19–22.
- Carlsen E, Giwercman A, Keiding N, Skakkbaek EN (1992): Evidence for decreasing quality of semen during past 50 years. BMJ 305:609–613.
- Fisch H, Goluboff ET (1996): Geographic variations in sperm counts: a potential cause of bias in studies of semen quality. Fertil Steril 65:1044–1046.
- Fisch H, Goluboff ET, Olson JH, Feldhuh J, Broder SJ, Barad DH (1996): Semen analysis in 1, 283 men from the United States over a 25-year period: no decline in quality. Fertil Steril 65:1009–1014.
- Henderson J, Baker HWG, Hanna PJ (1986): Occupation-related male infertility: a review. Clin Reprod Fertil 4:87–106.
- Irvine DS (1994): Falling sperm quality. BMJ 309:476.
- James WH (1980): Secular trend in reported sperm counts. Andrologia 12:381–388.
- Lipshultz L (1996): The debate continues: the continuing debate over the possible decline in semen quality. Fertil Steril 65:909–911.
- Macomber D, Sanders M (1929): The spermatozoa count: its value in the diagnosis, prognosis, and treatment of sterility. N Engl J Med 200:981–984.
- Matheus M, Sala MA, Barrionovo N, Franceschini SA (1986): Determination of the parameters of human semen in subjects with confirmed fertility. J Bras Ginecol 96:225–229.
- McLeod J, Gold RZ (1951): The male factor in fertility and infertility, II: spermatozoon counts in 1, 000 men of known fertility and in 1, 000 cases of infertility marriage. J Urol 66:436–448.
- Menkveld R, Van Zyl JA, Kotze T.TW, Joubert G (1986): Possible changes in male fertility over a 15-year period. Arch Androl 17:143–144.
- Nelson CM, Bunge RG (1974): Semen analysis: evidence for changing parameters of male fertility Potential. Fertil Steril 25:503–507.
- Paulsen CA, Berman NG, Wang CH (1996): Data from men in greater Seattle area reveals no downward trend in semen quality: further evidence that deterioration of semen quality is not geo-graphically uniform. Fertil Steril 65:1015–1020.
- Sharpe RM (1993): Declining sperm counts in men: Is there an endocrine cause? J Clin Endocrinol Metab 136:357–360.
- Schlegel PN, Ghang TSK, Marshall FF (1991): Antibiotics: potential hazards to male fertility. Fertil Steril 55:235–261.
- Swart Y, Khruger TF, Menkveld R, Schabort I, Lombard CJ (1991): Effect of lead and organophos-phates on sperm morphology. Arch Androl 26:67–70.
- Vierula M, Niemi M, Keiski A, Saaranen M, Saarikoski S, Suominen J (1996): High and unchanged sperm counts of Finnish men. Int J Androl 19:11–17.
- Weisman AT (1943): Spermatozoal counts in fertile males. Urol Curtan Rev 47:166–168.
- World Health Organization (1992): WHO Laboratory Manual for the Examination of Human Semen and Sperm-Cervical Mucus Interaction. Cambridge, UK: Cambridge University Press.