Bettencourt Pires, M. A.; Casal, D.; Mascarenhas de Lemos, L.; Godinho, C. E.; Pais, D.; Goyri-O’Neill, J. An Unusual Variety of the Extensor Digiti Muscles: Report With Notes on Repetition Strain Injuries. Acta Med Port 2013, 26, 278-283.