RT Journal Article SR Electronic T1 The prevalence of Neisseria gonorrhoeae negative for proline iminopeptidase in Asturias, Spain JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 76 OP 76 DO 10.1136/sti.2006.022699 VO 83 IS 1 A1 L Otero A1 M Alvarez-Argüelles A1 H Villar A1 J Díaz-Gigante A1 F Carreño A1 F Vázquez YR 2007 UL http://sti.bmj.com/content/83/1/76.2.abstract AB