How do they know these women weren’t crazy to begin with?
Part of conducting any successful study is in the proper selection of the subjects. Dr. Fergusson is a worldwide authority on conducting such studies, the results of which are being published in the leading peer-reviewed journal in the field. Including compromised subjects in the study would be the very most obvious, basic and elementary flaw imaginable and would result in the instant destruction of his career and the negation of his life's work. If this has happened in this case, rest assured that such a finding will be instantly pounced upon and published far and wide.