This image was adapted from a picture posted to gahag.net. All of the images on this site are in the public domain i.e. CC0. This site is only in Japanese but can be easily navigated with Google Translate.
團體治療
chairs、Comic characters、group、men、people、sharing、sitting、talking、therapy、women
椅子、漫畫人物、組、們、人、分享、坐在、說、治療、我們
資料來源：openclipart ( https://openclipart.org/ )