Short-termed changes in quantitative ultrasound estimated bone density among young men in an 18-weeks follow-up during their basic training for the Swiss Armed Forces oleh Michael Strässle, Jonas Grossmann, Patrick Eppenberger, Alexander Faas, Ivanka Jerkovic, Joël Floris, Lena Öhrström, Gülfirde Akgül, Lafi Aldakak, Frank Rühli, Nicole Bender, Kaspar Staub