RT Journal Article SR Electronic T1 Vaccination of older adults against herpes zoster is safe and effective JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP e43 OP e43 DO 10.1136/eb-2012-101138 VO 18 IS 5 A1 Stephen K Tyring YR 2013 UL http://ebm.bmj.com/content/18/5/e43.abstract AB