title: Old hat.
authors: R S
authors: RS
authors: Wolfsohn
mesh_terms: D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D006801:Humans; D010518:Periodontitis / Q000188:drug therapy*; D013752:Tetracycline / Q000008:administration & dosage*
chemical_list: D000900:Anti-Bacterial Agents; D013752:Tetracycline