Measures of anxiety: State‐Trait Anxiety Inventory (STAI), Beck Anxiety Inventory (BAI), and Hospital Anxiety and Depression Scale‐Anxiety (HADS‐A)

American Psychiatric Association, 1994, Diagnostic and statistical manual of mental disorders

10.1891/1061-3749.17.1.19

10.1016/j.jpsychores.2009.09.013

10.1891/jnum.11.3.283.61269

10.1002/art.20474

10.1093/rheumatology/41.2.184

White KP, 2002, Chronic widespread musculoskeletal pain with or without fibromyalgia: psychological distress in a representative community adult sample, J Rheumatol, 29, 588

10.1002/msc.107

10.1111/j.2044-8260.1983.tb00610.x

10.1016/S0022-3999(98)00109-3

10.1002/gps.1330

Spielberger C, 1983, Manual for the State‐Trait Anxiety Inventory

10.1037/h0056264

Cattell RB, 1963, Handbook for the IPAT Anxiety Scale

Spielberger CD, 1983, State‐Trait Anxiety Inventory

10.1016/S0887-6185(96)00033-3

10.1023/A:1010305200087

10.1037/0022-006X.56.6.893

10.3899/jrheum.100365

10.1016/j.apmr.2009.06.012

10.1207/s15327752jpa6003_10

10.1016/0887-6185(91)90002-B

10.1023/A:1022986728576

10.1016/0887-6185(92)90026-4

10.1016/0005-7967(94)00082-U

10.1007/BF00965034

10.1016/S0887-6185(97)00014-5

10.5021/ad.2010.22.4.389

10.1111/j.1600-0447.1983.tb09716.x

10.1007/s10067-010-1547-7

10.1016/S0022-3999(01)00296-3

10.1002/gps.930080209

10.1111/j.1600-0447.1997.tb10164.x

Lepine JP, 1985, Evaluation of anxiety and depression among patients hospitalized on an internal medicine service, Ann Med Psychol (Paris), 143, 175

10.1016/S0191-8869(97)80013-X

10.1348/000711200160255

10.1055/s-2008-1067578

Ertenli I, 2010, Infliximab, a TNF‐alpha antagonist treatment in patients with ankylosing spondylitis: the impact on depression, anxiety and quality of life level, Rheumatol Int, 1

10.1136/bmj.38965.375718.80

Valtysdottir ST, 2000, Anxiety and depression in patients with primary Sjögren's syndrome, J Rheumatol, 27, 165

10.1016/S0022-3999(98)00073-7

10.3899/jrheum.100857

10.1007/s10067-010-1651-8

10.1016/S0828-282X(10)70386-X

Elklit A, Psychological adjustment one year after the diagnosis of breast cancer: a prototype study of delayed post‐traumatic stress disorder, Br J Clin Psychol