1995a-250 1998g-314 administration adverseeffects aids(disease) anesthesia anesthetics biological biologicalmodels chlorineandderivativesasdisinfectants complications congresses control disinfectants distribution healthaspects hivinfections intravenousanesthesia intravenousanesthetics intravenousdrugabuse medicineintravenousanaesthesia models monitoring needle-exchangeprograms needleexchangeprograms needlesharing organization pharmacokinetics physiologic prevention substanceabuse supply transmission unitedstates wo285a24462003