title: Reply.
authors: Group Health Research Institute, Seattle, Washington.
authors: Karen J
authors: KJ
authors: Wernli
authors: University of North Carolina, Chapel Hill, Chapel Hill, North Carolina.
authors: Alison T
authors: AT
authors: Brenner
authors: RAND Corporation, Santa Monica, California.
authors: Carolyn M
authors: CM
authors: Rutter
authors: University of Washington, Seattle, Washington.
authors: John M
authors: JM
authors: Inadomi