Determination of average glandular dose with modern mammography units for two large groups of patients. - Klein,R.; Aichinger,H.; Dierker,J.; Jansen,M.TJ.; Joite-Barfuß,S.; Säbel,M.; Schulz-Wendtland,R.; Zoetelief,J. (Phys Med Biol, 1997)