Machado, Gustavo C., Pinheiro, Marina B., Lee, Hopin, Ahmed, Osman H., Hendrick, Paul, Williams, Chris, Kamper, Steven J.. Bailliere Tindall; 2017. Smartphone apps for the self-management of low back pain: a systematic review.

Ahmed, Osman H., Lee, Hopin, Struik, Laura L.. Churchill Livingstone; 2016. A picture tells a thousand words: a content analysis of concussion-related images online.