context: In Medicine and Surgery he received his doctorate in 1956, where he was also a specialist in speech and sound disorders and ear, nose and throat qualifications.
source: Professor's Honorary Title Sonninen was awarded in 1981.
reference_original: Der Ehrentitel des Professors Sonninen wurde ihm 1981 verliehen.
reference_flipped: Der Ehrentitel der Professorin Sonninen wurde ihr 1981 verliehen.