|They look alike. Madonna must really be a goat.|
The authors are Lewis L. Judd, Pamela J. Schettler, Hagop Akiskal [the very same], William Coryell, Jan Fawcett, Jess G. Fiedorowicz , David A. Solomon, and Martin B. Keller.
Voila! Almost anyone who has a depressive episode is immediately re-categorized as bipolar! Because they define it that way.
Of course, we knew that decades ago.