TY - BOOK ED - World Health Organization TI - WHO laboratory manual for the examination of human semen and sperm-cervical mucus interaction SN - 0521645999 PY - 1999/// CY - Cambridge, UK PB - Cambridge University Press KW - Semen KW - chemistry laboratory manuals KW - Spermatozoa KW - Cervix mucus KW - Sperm KW - Ovum interactions laboratory manuals ER -