1
All relevant reports were included regardless of publication date, case-patient age, or vaccine.
2
Results: Consensus was reached among the experts and the literature review identified 9 relevant reports.
3
Methods: Eligible studies were identified by searching several electronic databases for relevant reports published before September 2016.
4
They searched all relevant reports from original papers published from 1997 to December 2005.
5
Methods: A comprehensive literature search for relevant reports published up to April 2013 was performed using PubMed, Embase, Web of Science and Wanfang Data.