Clinician expertise (CONSORT-NPT item 15)
Provision of information about clinician qualifications, grade, number of AVBs previously undertaken (including those using the device under evaluation) and total number of births annually in the unit, were recorded. The number of clinicians undertaking AVBs in each trial group was documented, including whether they performed AVBs within one or more trial group. Information about study entry criteria for clinicians was extracted (e.g. supervision, eligibility or completion of pre-study training materials). Any descriptions or references to clinician learning curves were extracted verbatim.