title: Measure validation is an ongoing process: the Functional Assessment of Cancer Therapy-Breast Symptom Index as a case example.
authors.affiliation: Northwestern University Feinberg School of Medicine, 625 N. Michigan Ave., Suite 2700, Chicago, IL 60611, USA. sofia-garcia@northwestern.edu.
authors.forename: Sofia F
authors.initials: SF
authors.lastname: Garcia
authors.affiliation: Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Hahn