. 2018 Jan 14;41(3):393–401. doi: 10.1111/jvp.12477
© 2018 John Wiley & Sons Ltd
This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.