Characteristics of included studies, arranged alphabetically by first author.

<p>When studies contained more than one patient series each series was displayed separately. All available data are included, but if data were not extractable it is indicated by a “-“. Percentage and (number/total number of patients) are quoted, but if no patient number was quoted then a “NA” is used. If no information on serovars is present a “*” is used.</p><p>Characteristics of included studies, arranged alphabetically by first author.