O481 Detection by DHPLC of 23S rDNA mutations responsible for clarithromycin resistance in Helicobacter pylori - Coulon, C.; Lascols, C.; Pissard, S.; Deforges, L.; Delchier, J.C.; Soussy, C.J.; Cambau, E. (International Journal of Antimicrobial Agents, 2007)