MediastinitisSternumNegative-Pressure Wound TherapySternotomySurgical Wound InfectionRetropharyngeal AbscessDebridementPeriodontal AbscessFocal Infection, DentalWound Closure TechniquesCardiac Surgical ProceduresSurgical Wound DehiscenceMediastinumTherapeutic IrrigationEsophageal PerforationSclerosisOmentumThoracotomySurgical FlapsMycoplasma hominisDrainageTomography, X-Ray ComputedSuppurationCoronary Artery BypassPostoperative Complications