Discovery of Arthritis in Psoriasis Patients for Early Rheumatological Referral (DAPPER): Protocol for a Longitudinal Observational Study

Tamara W van Hal   ^{1, 2, 3} , MD ;   Juul MPA Van den Reek   ^{2, 3} , MD, PhD ;   Hans MM Groenewoud   ³ , MSc ;   Marcel C Pasch   ² , MD, PhD ;   Frank HJ Van den Hoogen   ^{1, 4} , MD, PhD ;   Mark H Wenink   ¹ , MD, PhD ;   Elke MGJ De Jong   ^{2, 3, 4} , MD, PhD

¹ Department of Rheumatology, Sint Maartenskliniek, Nijmegen, Netherlands

² Department of Dermatology, Radboud University Medical Center, Nijmegen, Netherlands

³ Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands

⁴ Faculty of Medical Sciences, Radboud University, Nijmegen, Netherlands