AU - Portney L FAU - Portney, Leslie G. AU - Watkins M FAU - Watkins, Mary P. TI - Validity of Measurements PT - BOOK SECTION DP - 2017 BTI - Foundations of Clinical Research: Applications to Practice, 3e DA - 2017 Y2 - 2024/03/28 UR - fadavispt.mhmedical.com/content.aspx?aid=1138250314