Newman, J.S., Laing, T.J., McCarthy, C.J., Adler, R.S. (1996) Power doppler sonography in synovitis: Assessment of therapeutic response-preliminary observations. Radiology, 198:582-584. Chiang, E.H., Laing, T.J., Meyer, C.R., Boes, J.L., Rubin, J.M., Adler, R.S. (1997) Ultrasonic characterization of in vitro osteoarthritic articular cartilage with validation by confocal microscopy. Ultrasound Med. Biol., 23:205-213.