Title {1}	A collaborative care psychosocial intervention to improve late life depression in socioeconomically deprived areas of Guarulhos, Brazil: the PROACTIVE cluster randomised controlled trial protocol.
Trial registration {2a and 2b}.	International Standard Randomised Controlled Trial Number (ISRCTN57805470).
Protocol version {3}	Version 2.0, 16th March 2020.
Funding {4}	São Paulo Research Foundation (FAPESP, process number 17/50094-2) Medical Research Council (MRC, process number MR/R006229/1).
Author details {5a}	(1) USP Medical School, University of São Paulo, Brazil (2) Engineering School, University of São Paulo, Brazil (3) Faculty of Science and Engineering, University of Limerick, Ireland (4) Bristol Medical School, University of Bristol, United Kingdom (5) Institute of Psychiatry, Psychology and Neuroscience, King’s College London, United Kingdom
Name and contact information for the trial sponsor {5b}	Sponsors: University of São Paulo (USP), Brazil King’s College London (KCL), United Kingdom Principal Investigators contact: Dr Marcia Scazufca, University of São Paulo, Brazil scazufca@usp.br Professor Ricardo Araya, King’s College London, United Kingdom ricardo.araya@kcl.ac.uk
Role of sponsor {5c}	The sponsors and funders have no roles in the design, conduction, analysis and interpretation, or in the writing or decision to submit the manuscript for publication.