“…Adjustment to the diagnosis and the GFD could, however, plausibly differ according to both age of diagnosis and duration of GFD, suggesting that these variables may also moderate the adherencedepression relationship. CD patients with comorbid IBS-type symptoms (Hauser, Musial, Caspary, Stein, & Stallmach, 2007), diabetes and autoimmune conditions (Garud et al, 2009), and elevated thyroid anti-bodies (Carta et al, 2002), have higher rates of depression than patients with CD alone, suggesting that controlling for the presence of comorbidities may also help to explain differences in effects. Representativeness and recruitment or selection bias are common problems in CD research, and it is possible that differences in motivation and dietary vigilance exist according to membership of a coeliac society (Hall et al, 2009), which may change the results if more diverse recruitment methods were used.…”