1. Department of Earth Sciences, University of Southern California , 3651 Trousedale Pkwy, Zumberge Hall, Los Angeles, CA 90089 , USA
2. Dinosaur Institute, Natural History Museum of Los Angeles County , 900 Exposition Blvd, Los Angeles, CA 90007-4057 , USA
3. UCLA Cardiac Arrhythmia Center, Division of Cardiology , 100 Medical Plaza, Suite 660, Los Angeles, CA 90095 , USA
4. Department of Mammalogy, Natural History Museum of Los Angeles County , 900 Exposition Blvd, Los Angelss, CA 90007-4057 , USA