Techniques - Procedures Complete closure of the abdominal wall and skin follows the completion of the index surgical procedure. Closed suction drains may be used at the time of skin closure in any patient who requires skin flap elevation to attain skin closure. Skin closure will be accomplished with dermal sutures and / or staples. Wound coverage will be done with the NPWT Prevena ™ Incision Management System (Kinetic Concepts Inc, San Antonio, TX). The application of the NPWT will be done as per manufacturer's instructions of use. The application of continuous negative pressure will be applied at 125 mm Hg.Antibiotics will be given to all patients. The post-operative use of antibiotics in the clear contaminated and contaminated cases will be 24-hour of prophylactic administration. The post-operative use of antibiotics for the dirty (infected) cases will be of therapeutic administration, as clinically indicated. In infected patients, cultures will be taken at the time of the index procedure, and the antibiotic treatment will be targeted to the culture results. Wounds will be assessed every 48 hours by dressing changes, and also at the time of final dressing removal and at 2 and 4 weeks after surgery. The dressing removal will take place at discharge OR at 5 - 7 post-operative days OR if clinically indicated, whichever comes first. Post-discharge follow-up The patients will be followed-up per routine at the surgical clinic. At 2 and 4 weeks after the date of the operation a formal evaluation will take place. Both evaluations must be in person at the surgical clinic.