1. Disorders of the alimentary tract;Barnes,1974
2. Medical and surgical complications during pregnancy;Benson,1980
3. Gastrointestinal disorders;Greenhill,1974
4. Gastrointestinal diseases;Winship,1975
5. In vitro inhibitory effect of progesterone on extrauterine human smooth muscle;Kumar;Am J Obstet Gynecol,1962