These claims have not been documented. Human experiments have not been well documented. Only rare chronic infections have been documented. Chimerism has been documented in humans in several instances. The early settlements have been well documented. Though rare in humans, cases have been documented. They have been documented in Kelabit. Twins have been occasionally documented in some species, however. Over 1,500 supercentenarians have been documented in history. Paternal care has not been documented. Though rare, domestication has been documented. These phenomena have been documented observationally, experimentally, and theoretically. This case distinction was subsequently documented as canonical. Proof of effectiveness is poorly documented or absent. Theft of bitcoin has been documented on numerous occasions.