Grady G F, Lee V A, Prince A M, Gitnick G L, Fawaz K A, Vyas G N, Levitt M D, Senior J R, Galambos J T, Bynum T E, Singleton J W, Clowdus B F, Akdamar K, Aach R D, Winkelman E I, Schiff G M, Hersh T
J Infect Dis. 1978 Nov;138(5):625-38. doi: 10.1093/infdis/138.5.625.