Mosaic Distal 13q Duplication Due to Mosaic Unbalanced Translocation of 46,xy,der(14)t(13;14)(q32.2;p13)/46,xy at Amniocentesis in a Pregnancy Associated with a Favorable Fetal Outcome, Perinatal Progressive Decrease of the Aneuploid Cell Line and Cytogenetic Discrepancy Between Cultured Amniocytes and Uncultured Amniocytes