Excerpt from Psychoses Associated With Influenza, Vol. 1: General Data, Statistical AnalysisGroup IV comprises the cases in which there was enough doubt or difference in opinion on the part of the staff to justify leaving the case unclassified. That is to say, this is a group in which we did not feel certain of any one diagnosis.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.