1. From the Departments of Cell Biology (IL and TY) and Anatomy (PT), Medical School, University of Tampere, Tampere, Finland; the Department of Epidemiology, Tampere School of Public Health, University of Tampere, Tampere, Finland (AA); Tampere School of Public Health, University of Tampere, Tampere, Finland (RH); the Garrison Hospital, Pori Brigade, Finnish Defence Forces, Säkylä, Finland (J-PR);