- Correspondence to Dr Heather Murdoch, Immunisation Team, Health Protection Scotland, Meridian Court, 5 Cadogan Street, Glasgow, G2 6QE, UK;
- Received 23 March 2017
- Revised 9 August 2017
- Accepted 10 August 2017
- Published in print 1 October 2017.
- Published online 20 September 2017.
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