1. LeRoy EC, Black C, Fleischmajer R, et al. Scleroderma (systemic sclerosis): classification, subsets and pathogenesis. J Rheumatol. 1988;15:202–5.
2. Clements PJ, Becvar R, Drosos AA, Ghattas L, Gabrielli A. Assessment of gastrointestinal involvement. Clin Exp Rheumatol. 2003;21:S15–8.
3. Forbes A, Marie I. Gastrointestinal complications: the most frequent internal complications of systemic sclerosis. Rheumatology (Oxford). 2009;48 Suppl 3:iii36–9.
4. Steen VD, Medsger TA. Changes in causes of death in systemic sclerosis, 1972–2002. Ann Rheum Dis. 2007;66:940–4.
5. Vitali C, Borghi E, Napoletano A, et al. Oropharyngolaryngeal disorders in scleroderma: development and validation of the SLS scale. Dysphagia. 2010;25:127–38.