title: Letter to the Editor: Response to: Commentary on the history and quantitative nature of filter paper used in blood collection devices.
authors.affiliation: Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.  kissingp@purdue.edu.
authors.forename: Peter T
authors.initials: PT
authors.lastname: Kissinger
mesh_terms: D001800:Blood Specimen Collection / Q000379:methods* / Q000592:standards; D004345:Drug Industry; D012680:Sensitivity and Specificity; D009626:Terminology as Topic