title: Authors' reply to Lees.
authors.affiliation: National Institute of Neurological Disorders and Stroke, Bethesda, MD 20892, USA.
authors.forename: Karin B
authors.initials: KB
authors.lastname: Nelson
authors.affiliation: Deans and Lyons, Houston, TX, USA.
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Sartwelle
authors.affiliation: Women and Infants' Hospital of Rhode Island and Brown University, Providence, RI, USA.
authors.forename: Dwight J
authors.initials: DJ
authors.lastname: Rouse