Pelvic InfectionBacteroides fragilisPelvic Inflammatory DiseaseBacteroidesBacteroides InfectionsIntrauterine DevicesLactamsBacteria, AnaerobicPrevotella melaninogenicaFusobacteriumClindamycinCefoxitinMicrobial Sensitivity TestsAbscessAnaerobiosisMetronidazoleDrug Resistance, MicrobialAnti-Bacterial Agents