Study	Reason for exclusion
Abu‐Shakra 1995	Wrong study design
Atzeni 2011	Wrong intervention
Baranauskaite 2012	Wrong comparator
Bird 1977	Could not extract PsA outcomes
Calguneri 2004	Wrong study design
Coates 2013	Wrong comparator
Coates 2014	Wrong comparator
Coates 2015a	Wrong comparator
Coates 2015b	Wrong comparator
Coates 2016a	Wrong comparator
Coates 2017	Wrong comparator
Collins 2015	Wrong intervention
Combe 2013	Wrong study design
Combe 2016	Wrong study design
Conti 2008	Wrong intervention
Feldges 1974	Wrong study design
Fraser 2005	Wrong patient population
Glinatsi 2015	Wrong patient population
Gottlieb 2016a	Wrong intervention
Gottlieb 2016b	Wrong intervention
Goupille 1995	Wrong study design
Hall 1978	Could not extract PsA outcomes
Ischenko 2010	Wrong comparator
Kavanaugh 2006a	Wrong patient population
Kavanaugh 2006b	Wrong patient population
Kavanaugh 2012	Wrong intervention
Khraishi 2016	Wrong intervention
Mazzanti 1994	Wrong study design
McInnes 2015	Wrong intervention
Mease 2015	Wrong intervention
Mease 2016	Wrong patient population
Merola 2016	Wrong study design
Min 2016	Wrong intervention
O'Brien 1962	Wrong comparator
Raffayova 2009a	Wrong comparator
Raffayova 2009b	Wrong comparator
Saurat 2010	Wrong patient population
Schett 2011	Wrong intervention
Schett 2012	Wrong intervention
Szentpetery 2014	Wrong intervention