1. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109-1005, United States
2. Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
3. Department of Orthopaedic Surgery and Rehabilitation, University of Nebraska Medical Center, Omaha, Nebraska 68198-5360, United States