1. Schaefert R, Hausteiner-Wiehle C, Hauser W, Ronel J, Herrmann M, Henningsen P. Non-specific, functional, and somatoform bodily complaints. Dtsch Arztebl Int. 2012;109(47):803–13.
2. Shedden-Mora M, Lau K, Kuby A, Gross B, Gladigau M, Fabisch A, Loewe B. Improving health Care for Patients with somatoform and functional disorders: a collaborative stepped care network (Sofu-net). Psychiatr Prax. 2015;42(Suppl 1):S60–4.
3. Loewe B, Spitzer RL, Williams JB, Mussell M, Schellberg D, Kroenke K. Depression, anxiety and somatization in primary care: syndrome overlap and functional impairment. Gen Hosp Psychiatry. 2008;30(3):191–9.
4. Steinbrecher N, Koerber S, Frieser D, Hiller W. The prevalence of medically unexplained symptoms in primary care. Psychosomatics. 2011;52(3):263–71.
5. de Waal MW, Arnold IA, Eekhof JA, van Hemert AM. Somatoform disorders in general practice: prevalence, functional impairment and comorbidity with anxiety and depressive disorders. Br J Psychiatry. 2004;184:470–6.