Additional file 1: of The concomitant administration of systemic amoxicillin and metronidazole compared to scaling and root planing alone in treating periodontitis: =a systematic review= ZandbergenDina SlotDagmar NiedermanRichard Van der WeijdenFridus 2016 Online Supportive Appendices (additional file S61: [ 55 – 77 ]). (DOC 1276 kb)