"A male fertility issue defined as a low sperm concentration in the ejaculate."^^ . "oligospermia"^^ . "ICD9CM:606.1"^^ . "NCI:C34860"^^ . "UMLS_CUI:C0028960"^^ . . . . "MESH:D009845"^^ . "disease_ontology"^^ . "DOID:14228"^^ . . "ICD10CM:N46.1"^^ .