Teen die 1950's het hy, as die wêreld se grootste kenner op dié gebied, verklaar dat hy minder as 150 ware gevalle van hierdie sindroom gesien het, terwyl hy verwysings van plekke so ver as Suid-Afrika hanteer het.
By the 1950s, as the world's leading authority on the subject, he declared that he had seen less than 150 true cases of his syndrome while fielding referrals from as far away as South Africa.