| http://www.w3.org/ns/prov#value | - In this embodiment, chemical stimulation of the SPG system (defined hereinabove), and/or of at least one other appropriate MTS, is achieved by presenting chemicals, for example in a liquid or gaseous state, to an air passage of the subject, such as a nasal cavity, a throat, a greater palatine canal, or a sphenopalatine foramen.
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