Title {1}	A multicentre observational psoriatic arthritis cohort study addressing real-life outcomes of a treat to target approach in routine clinical practice.
Trial registration {2a and 2b}.	NCT03531073 https://clinicaltrials.gov/ct2/show/NCT03531073 retrospectively registered 21 May 2018.
Protocol version {3}	V6.0 28Jul2020
Funding {4}	Funded by National Institute for Health Research CS-2016-16-016
Author details {5a}	Ines Rombach, Oxford Clinical Trials Research Unit, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK William Tillett, Royal National Hospital for Rheumatic Diseases, Bath, UK, Department of Department of Pharmacy and Pharmacology, University of Bath, UK Deepak Jadon, Department of Medicine, University of Cambridge, Cambridge, UK Laura Tucker, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK Marion Watson, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK Anne Francis, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK Yvonne Sinomati, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK Lucy Eldridge, Oxford Clinical Trials Research Unit, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK. Melina Dritsaki, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK. Susan J Dutton, Oxford Clinical Trial Research Unit, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK. Hussein Al-Mossawi, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK. Nicola Gullick, Rheumatology Department, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, United Kingdom. Ben Thompson, Department of Rheumatology, Musculoskeletal Unit, Newcastle-upon-Tyne Hospitals NHS Trust, UK Laura Coates, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford and Oxford Biomedical Research Centre, Oxford University Hospitals Trust, Oxford, UK.
Name and contact information for the trial sponsor {5b}	University of Oxford Clinical Trials and Research Governance, Boundary Brook House, Churchill Drive, Headington, OXON, OX3 7LQ Email: ctrg@admin.ox.ac.uk
Role of sponsor {5c}	The study sponsor provided minor input into study design and oversees data collection, management and analysis of study data. The funder has no role in study design but will review any publications prior to publication.