“…The studies came from a wide geographic area and the authors represented a number of institutions. Four were completed in Ohio (5,6,7,22); three in Illinois (10,13,14); two each in Georgia (11,16), Minnesota (1,9), New Jersey (8,19), New York (4,20), and Wisconsin (12,17); and one each in California (15), Iowa (2), Maryland (13), New Mexico (24), Pennsylvania (21), and Tennessee (3). Although Powers' paper (18) was published while he was at the University of Arkansas, his subjects attended an unnamed university in the midwest.…”