Both errors were corrected for subsequent reissues. This was an inadvertent error which has been corrected. The errors, in this case, are therefore not corrected but consolidated. Hence they never get corrected for errors in UG. On second cut, they corrected this error. In later editions this mistake was corrected. However, this error was corrected in future pressings. When detected early, shunt often can be corrected through surgery. One source even corrected its article and clarified the misunderstanding. It corrected some bugs, but was otherwise unchanged. Alveolar prognathism can also easily be corrected with fixed orthodontic therapy. Thus some methodological weaknesses in studies can be corrected statistically. The defect has been corrected since 1992. If a reversible cause is found, that cause should be corrected if possible. This problem is later corrected in toremifene.