RT Journal Article SR Electronic T1 MHRA guidance on assessing renal function JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 20 OP 20 DO 10.1136/dtb.2019.000087 VO 58 IS 2 YR 2020 UL http://dtb.bmj.com/content/58/2/20.abstract AB