In ref. 1, an error was published in the title of the article on page 268.Weight reduction by using a formula diet recovers menstruation in obesepatients with an ovulatory disorder.The title was incorrect and should be:Weight reduction using a formula diet recovers menstruation in obesepatients with an ovulatory disorder.The title has also been corrected online on 2nd November 2017.The author apologizes for this error.