Color Doppler ultrasound imaging in varicoceles: Is the difference in venous diameter encountered during Valsalva predictive of palpable varicocele grade? oleh Kelly Lehner, Catherine Ingram, Utsav Bansal, Colleen Baca, Adithya Balasubramanian, Nannan Thirumavalavan, Jason M. Scovell, Saneal Rajanahally, Matthew Pollard, Larry I. Lipshultz