2Franken DR.African experience with sperm morphology training courses.Rep rod Biomed Online,2003,7(1):114-119.
3Cooper TG,Bjorndahl L,Vreeburg J,et al.Semen analysis and external quality control schemes for semen analysis need global standardization.Int J Androl,2002,25(5):306-311.
4Auger J,Eustache F,DucotB,et al.Intra-and inter-individual variability in human sperm concentration,motility and vitality as-sessment during a workshop involving ten laboratories.Hum Rep rod,2000,15(11):2360-2368.
