§ arizonacert.org (drug interactions) § www.drug-interactions.com (P450-mediated drug interactions) § www.torsades.org (drug-induced arrhythmia) § www.penncert.org (antibiotics) § www.dcri.duke.edu/research/fields/certs.html (cardiovascular therapeutics) § www.sph.unc.edu/healthoutcomes/certs/index.htm (therapeutics in pediatrics) § www.uab.edu (therapeutics of musculoskeletal disorders)