RT Journal Article SR Electronic T1 Sunscreen SPFs: clear as daylight? JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 61 OP 61 DO 10.1136/dtb.2011.02.0033 VO 49 IS 6 YR 2011 UL http://dtb.bmj.com/content/49/6/61.abstract AB