"Movement of the sacroiliac joint during the active straight leg raise test in patients with long-lasting severe sacroiliac joint pain"—A letter to the editor. (February 2018) - Hu, Hai; Prins, Maarten R.; Wu, Wen-Hua; van Dieën, Jaap H.; Xia, Chun; Mens, Jan M.A.; Meijer, Onno G.