title: A complex, contagious, evolutionary habit.
authors.affiliation: Naval Medicine and Hyperbaric Centre, Republic of Singapore Navy, Singapore.
authors.forename: Arulanandam
authors.initials: A
authors.lastname: Shalini
authors.forename: Sechachalam
authors.initials: S
authors.lastname: Sreedharan
mesh_terms: D005075:Biological Evolution; D006184:Habits; D006801:Humans; D015000:Yawning / Q000502:physiology*