1. March of Dimes Prematurity Research Ctr., Washington Univ. in St. Louis
2. Caltech
3. NIH Resource Ctr. for Medical Ultrasonic Transducer Technology, The Univ. of Southern California
4. Texas A&M Univ.
5. Washington Univ. in St. Louis
6. NIH Ultrasonic Transducer Resource Ctr., The Univ. of Southern California