RT Journal Article SR Electronic T1 Basics of study design: Practical considerations JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP e10 OP e19 DO 10.3949/ccjm.84.s2.03 VO 84 IS 9 suppl 2 A1 Robert L. Chatburn YR 2017 UL http://www.ccjm.org/content/84/9_suppl_2/e10.abstract AB