A. Na

Ultrasonic “hole sign”: A reliable sign of perforation of the gallbladder?

Siu-Wai Chan, C. Wong, S. Chan, 1992, Journal of clinical ultrasound : JCU.

Real‐time ultrasound diagnosis of intramural intestinal hematoma

W. Chau, A. Na, Ching-Wen Chang, 1989, Journal of clinical ultrasound : JCU.

Ultrasound diagnosis of perforation of the gallbladder: Real‐time application and the demonstration of a new sonographic sign

Y. Li, W. Chau, A. Na, 1988, Journal of clinical ultrasound : JCU.