Systematic review of virtual speech therapists for speech disorders. - Yi-Ping Phoebe Chen; Caddi Johnson; Pooia Lalbakhsh; Terry Caelli; Guang Deng; David B. H. Tay; Shane Erickson; Philip Broadbridge; Amr El Refaie; Wendy Doube; Meg E. Morris (Comput. Speech Lang., 2016)