VEGFA and psoriatic arthritis: Circulating VEGF levels were significantly higher in PsA (SMD 0.98, 95% CI 0.62–1.34, P <0.0001) (Figure S4A), in psoriatic arthritis (SMD 0.72, 95% CI 0.12–1.32, P = 0.0192) (Figure S4B), and psoriasis with skin involvement (SMD 1.26, 95% CI 0.65–1.86, P = 0.0001) than in HC (Figure S4C).