Key points are not available for this paper at this time.
Joseph W. Mountin, Elliott H. Pennell, Georgie S. Brockett, Location and Movement of Physicians, 1923 and 1938: Changes in Urban and Rural Totals for Established Physicians, Public Health Reports (1896-1970), Vol. 60, No. 7 (Feb. 16, 1945), pp. 173-185
Mountin et al. (1945) studied this question.