Question: Jan G. Švec, born on which date, is a Czech voice scientist, he is the inventor of videokymography, a method for high-speed visualization of vocal-fold vibrations, which is being used for advanced diagnosis of voice disorders, the term phonation has slightly different meanings depending on the subfield of phonetics?
Sentence (from "Phonation"): Voiceless and supra-glottal phonations are included under this definition.
Relevant evidence: No