[1] Univ Pittsburgh, Sch Dent Med, Ctr Patients Special Needs, Dept Dent Anesthesiol, Pittsburgh, PA 15261 USA
[2] Tufts Univ, Tufts Med Ctr, Sch Dent Med, Div Anesthesia & Pain Control, Boston, MA 02111 USA
[3] Tufts Univ, Sch Med, Dept Anesthesiol, Boston, MA 02111 USA
[4] Univ Cincinnati, Acad Hlth Ctr, Coll Med UCCOM, Dept Anesthesiol, Cincinnati, OH 45267 USA