title: A need to know.
authors.affiliation: a University of Calgary Calgary , Alberta.
authors.forename: J
authors.initials: J
authors.lastname: Bullard
authors.affiliation: b University of Rochester Rochester , New York.
authors.forename: A B
authors.initials: AB
authors.lastname: Craig
authors.affiliation: c Evansville , Indiana.
authors.forename: R C
authors.initials: RC
authors.lastname: Combs
authors.affiliation: d Hahnemann Medical College & Hospital Philadelphia.
authors.forename: C
authors.initials: C
authors.lastname: Swartz