Which of the following was not involved in the development of a classification system of mental illnesses in the 1800's?

Name: Which of the following was not involved in the development of a classification system of mental illnesses in the 1800's?
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John Cade was not involved in the development of a classification system of mental illnesses in the 1800's. J. Esquirol, Philippe Pinel, and Emil Kraepelin were all prominent figures in the development of classification systems during this time period.

Which of the Following Was Not Involved in the Development