1 disease that is common. 1 disease that is very rare. 28 diseases without any prevalence information. Causes of Barrel chest without any prevalence information The following causes of Barrel chest are ones for which we do not have any prevalence information.
Definition of flashback for English Language Learners. : a part of a story or movie that describes or shows something that happened in the past.
Backchannel (linguistics) In linguistics, backchannels are listener responses in a primarily one-way communication. These can be both verbal and non-verbal in nature, and are frequently phatic expressions, primarily serving a social or meta-conversational purpose, rather than involving substantial two-way communication.