RT Journal Article SR Electronic T1 VASECTOMY FOLLOW UP JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 126 OP 127 VO 26 IS 163 A1 L. N. Jackson YR 1976 UL http://bjgp.org/content/26/163/126.3.abstract AB