Sign-Lingo - Feasibility of a Serious Game for Involving Parents in the Language Development of Their Deaf or Hearing Impaired Child Topics: Development of Assistive Technology; Human-Machine Interfaces for Disabled Persons; ICT, Ageing and Disability In Proceedings of the 10th International Joint Conference on Biomedical Engineering Systems and Technologies - Volume 5: BIOSTEC, 191-198, 2017 , Porto, Portugal