An overview of papers published can be found here.
Some recent papers:
Singer, S., Sievers, L., Linn, L.-M., Janke, J., Dietsch, L., & Negwer, V. (epub ahead). What is considered to be emotional suffering by psychotherapy patients and their therapists in Eastern versus Western Germany? A mixed-methods study. Counselling and Psychotherapy Research, doi.org/10.1002/capr.12345.
Singer S, Jordan S, Locati LD, Pinto M, Tomaszewska IM, Araújo C, Hammerlid E, Vidhubala E, Husson O, Kiyota N, Brannan C, Salem D, Gamper EM, Arraras JI, Ioannidis G, Andry G, Inhestern J, Grégoire V, Licitra L; EORTC Quality of Life Group, the EORTC Head and Neck Cancer Group, and the EORTC Endocrine Task Force (2017). The EORTC module for quality of life in patients with thyroid cancer: phase III. Endocr Relat Cancer. 24(4):197-207