^a University of California, San Francisco, CA, USA

^b Norland corporation, Fort Atkinson, WI, USA

^c Wright State University, Dayton, OH, USA

^d Lunar Corporation, Madison, WI, USA

^e University of Erlangen, Germany

^g Japanese Society of Bone and Mineral Research, Japan

^f Lunar Corporation, Madison, WI, USA

^h Stratec Medizintechnik GMBH, Pforzheim, Germany

ⁱ Hologic Inc., Waltham, MA, USA

^j Hologic Inc., Waltham, MA, USA

^k Aloka Inc., Japan