Geneva World Health Organization; 2010; WHO Laboratory Manual for the Examination and Processing of Human Semen, 5th ed. David ... Gynaecological Endocrinology & Reproductive Medicine Grevenbroich, Heinrich-Heine University of Duesseldorf, Germany. (en) « ... p1992; WHO Laboratory Manual for the Examination of Human Semen and Sperm-Cervical Mucus Interaction. World Health Organization ...