| http://www.w3.org/ns/prov#value | - These can be either overt and observable by others, such as checking that a door is locked, or a covert mental act that cannot be observed, such as repeating a certain phrase in one's mind.It is thought that 1???2% of the population have OCD, although some studies have estimated 2???3%.BDD is characterised by a preoccupation with an imagined defect in appearance, or in the case of a slight physica
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