In the absence of a single test for aphasic impairment validated in all three languages, measures of aphasic impairment will only be considered as secondary outcome measures. Each participant will be assessed with a test battery that is commonly used by the majority of speech and language therapists in the corresponding languages: the Aachen Aphasia Test (AAT) in German; the Protocole Montréal-Toulouse 86 (MT) in French; and the Western Aphasia Battery (WAB) in English. The tests will be repeated 1 and 30 days after the last treatment session. In addition the Bilingual Aphasia Test (BAT) will be used, in order to validate its sensitivity to detected changes in language performance during aphasia recovery for future studies.