039 Y-Chromosome Abnormalities in Men with Sub-Fertility. An Analysis of the Frequency of Abnormalities and Determination of a Threshold Sperm Concentration for Genetic Analysis. (1st July 2018) - Johnson, M.; Raheem, A.; De Luca, F.; Johnson, T.F.; Zainal, Y.; Poselay, S.; Hallerstrom, M.; Mohammadi, B.; Moubasher, A.; Sangster, P.; Muneer, A.; Ralph, D.