References
- Hewlett S, Carr M, Ryan S, Kirwan J, Richards P, Carr A, et al. Outcomes generated by patients with rheumatoid arthritis: how important are they? Musculoskeletal Care 2005;3:131–42.
- Westhoff G, Buttgereit F, Gromnica-Ihle E, Zink A. Morning stiffness and its influence on early retirement in patients with recent onset rheumatoid arthritis. Rheumatology 2008;47:980–4.
- Yazici Y, Pincus T, Kautiainen H, Sokka T. Morning stiffness in patients with early rheumatoid arthritis is associated more strongly with functional disability than with joint swelling and erythrocyte sedimentation rate. J Rheumatol 2004;31:1723–6.
- Sierakowski S, Cutolo M. Morning symptoms in rheumatoid arthritis: a defining characteristic and marker of active disease. Scand J Rheumatol 2011;41(Suppl 125):1–5.
- Khan N, Yazici Y, Calvo-Alen J, Dadoniene J, Gossec L, Hansen TM, et al. Reevaluation of the role of duration of morning stiffness in the assessment of rheumatoid arthritis activity. J Rheumatol 2009;36:2435–42.
- Tuominen R, Tuominen S, Möttönen T. Consistency of assessments and willingness to pay for a reduction in morning symptoms over time in patients with rheumatoid arthritis. Scand J Rheumatol 2012;41:438–41.
- Hazes JMW, Hayton R, Burt J, Silman AJ. Consistency of morning stiffness: an analysis of diary data. Br J Rheum 1994;33:562–5.
- Tuominen R, Azbel M, Hemmilä J, Möttönen T. Willingness to pay for improvement of physical function among rheumatoid arthritis patients as measured by Health Assessment Questionnaire. Rheumatol Int 2011;31:347–52.
- Tuominen R, Tuominen S, Möttönen T. How much is a reduction in morning stiffness worth to patients? Scand J Rheumatol 2011;41(Suppl 125):12–16.
- Slothuus U, Brooks R. Willingness to pay in arthritis: a Danish contribution. Rheumatology 2000;39:791–9.
- Fautrel B, Clarke AE, Guillemin F, Adam V, St-Pierre Y, Panaritis T, et al. Valuing a hypothetical cure for rheumatoid arthritis using the contingent valuation methodology: the patient perspective. J Rheumatol 2005;32:443–53.
- Gyldmark M, Morrison G. Demand for health care in Denmark: results of a national sample survey using contingent valuation. Soc Sci Med 2001;53:1023–36.
- Olsen J, Donaldson C. Helicopters, hearts and hips: using willingness to pay to set priorities for public sector health care programmes. Soc Sci Med 1998;46:1–12.
- Gibb S, Donaldson C, Henshaw R. Assessing strength of preference for abortion method using ‘willingness to pay’: a useful research technique for measuring values. J Adv Nurs 1998;27:30–6.
- O’Brien B, Gafni A. When do the “dollars” make sense? Toward a conceptual framework for contingent valuation studies in health care. Med Decis Making 1996;16:288–99.
- Cross M, March L, Lapsey H, Tribe KL, Brnabic AJ, Courtenay BG, et al. Determinants of willingness to pay for hip and knee joint replacement surgery for osteoarthritis. Rheumatology 2000;39:1242–8.
- Verstappen S, Jacobs J, Huisman A-M, van Rijthoven A, Sokka T, Bijlsma J. Functional health assessment questionaire (HAQ) and psychological HAQ are associated with and predicted by different factors in rheumatoid arthritis. J Rheumatol 2007;34:1837–40.
- Pincus T, Sokka T, Wolfe F. Premature mortality in patients with rheumatoid arthritis: evolving concepts. Arthritis Rheum 2001;44:1234–6.
- Yelin E, Turpin L, Wong B, Rush S. The impact of functional status and change in functional status on mortality over 18 years among persons with rheumatoid arthritis. J Rheumatol 2002;29:1851–7.
- Kobelt G, Jönsson B. The burden of rheumatoid arhritis and access to treatment: outcome and cost-utility of treatments. Eur J Health Econ 2008;8(Suppl 2):95–106.
- Donaldson C. Valuing the benefits of publicly-provided health care: does ‘ability ot pay’ preclude the use of ‘willingness-to-pay’? Soc Sci Med 1999;49:551–63.