Footnotes

• Collaborators Adriana Maria Kakehasi, Ana Paula Monteiro Gomides, Eduardo dos Santos Paiva, Gecilmara Cristina Salviato Pileggii, Gilda Aparecida Ferreira, Licia Maria Henrique da Mota, Ricardo Machado Xavier.

• Contributors All authors have participated in the study to the conception or design of the work, or the acquisition, analysis or interpretation of cases; and subsequent revisions of the manuscript.

• 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 and public involvement Patients and/or the public were not involved in the design, conduct, reporting or dissemination plans of this research.

• Provenance and peer review Not commissioned; internally peer reviewed.