“…Yet, the existing studies addressing symptom attribution are not satisfactory and do not allow reliable conclusions to be drawn on the importance of misattributions in hypochondriasis, for the following reasons: several studies investigating symptom attribution are based on samples that do not meet the diagnostic criteria for hypochondriasis, but only suffer from increased health anxiety as assessed by questionnaires (e.g., MacLeod et al, 1998;Sensky et al, 1998). Other studies do not investigate hypochondriasis separately, but in combination with other somatoform disorders (Duddu et al, 2003;Groben & Hausteiner, 2011;Henningsen et al, 2005;Hiller et al, 2010;Martin et al, 2007;Rief et al, 2004). In addition, most existing research lacks clinical control groups and therefore does not enable a meaningful differentiation to be made from related disorders (e.g., Barsky, Coeytaux, Sarnie, & Cleary, 1993;Haenen, de Jong, Schmidt, Stevens, & Visser, 2000;Marcus, 1999;Marcus & Church, 2003).…”