Procedures 1 & 2: Subcutaneous infiltration of tumescent cefazolin: Two of the four investigative procedures will begin with infiltration of a solution of tumescent local anesthesia containing cefazolin. Following infiltration of subcutaneous tumescent local anesthesia containing cefazolin approximately 9 sequential blood and tissue samples are taken over 12 to 24 hours. In these two studies a minimal volume of liposuction (10 ml to 12 ml using a hand held syringe) will be done in order to obtain samples of subcutaneous fat and tumescent subcutaneous interstitial tissue-fluid for measurement of cefazolin and metronidazole concentration.