About the Authors

Tracey Smythe

Contributed equally to this work with: Tracey Smythe, Monica Matos, Julia Reis

Roles Conceptualization, Data curation, Formal analysis, Investigation, Writing – original draft, Writing – review & editing

tracey.smythe@lshtm.ac.uk

Affiliation International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, Keppel Street, London, United Kingdom

Monica Matos

Contributed equally to this work with: Tracey Smythe, Monica Matos, Julia Reis

Roles Formal analysis, Investigation, Methodology, Writing – review & editing

Affiliation Collective Health Institute, Universidade Federal da Bahia, Salvador, Brazil

Julia Reis

Contributed equally to this work with: Tracey Smythe, Monica Matos, Julia Reis

Roles Conceptualization, Investigation, Writing – review & editing

Affiliation Department of Child Psychology, Rehabilitation Institute of Bahia, Salvador, Brazil

Antony Duttine

Roles Conceptualization, Investigation, Methodology, Writing – review & editing

‡ These authors contributed equally to this work

Affiliation International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, Keppel Street, London, United Kingdom

Silvia Ferrite

Roles Methodology, Supervision, Writing – review & editing

‡ These authors contributed equally to this work

Affiliation Department of Speech and Hearing Sciences, Federal University of Bahia, Salvador, Brazil

Hannah Kuper

Roles Conceptualization, Funding acquisition, Supervision, Writing – review & editing

‡ These authors contributed equally to this work

Affiliation International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, Keppel Street, London, United Kingdom

Competing Interests

I have read the journal's policy and the authors of this manuscript have the following competing interests: One of the authors (AD) joined the Pan American Health Organisation (PAHO) during the research period. Work on the research study was undertaken outside and separate to his PAHO duties. This does not alter our adherence to PLOS ONE policies on sharing data and materials.