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Contributors MM, IM, KD and MC were involved in all data collection, analysis and write-up of the article. LP, CL and RS performed national survey. LP and LJ performed literature search and revised the final article. RM supervised project and revised the final article.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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