Acknowledgements
We thank Silvia Andreozzi and Mauro Bucciarelli for their valuable
technical support and assistance to the operation of the web-based data
collection system.
We thank Clarissa Bostford for language editing.
Our heartfelt thanks go to all the clinicians working in the national
network of maternity units (Appendix 1) for the assistance offered to
women and for collecting the data, we thank all women who agreed to
participate in the study.
Disclosure of interest
All authors have completed the ICMJE uniform disclosure form and declare
no support from any organisation for the submitted work; no financial
relationships with any organisations that might have an interest in the
submitted work in the previous three years; no other relationships or
activities that could appear to have influenced the submitted work.