1. 1Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA
2. 2Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA
3. 3Biostatistics Program, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA
4. 4Life Science Division, NASA Ames Research Center, Moffett Field, California, USA