1. Ultrasound visual image-guided vs Doppler auditory-assisted radial artery cannulation in infants and small children by non-expert anaesthesiologists: a randomized prospective study† 
K. Ueda, S. Puangsuvan, M.A. Hove, E.O. Bayman 
British Journal of Anaesthesia 
Volume 110, Issue 2, Pages (February 2013)
DOI: /bja/aes383
Copyright © 2013 The Author(s) Terms and Conditions

2. Fig 1
Cumulative successful cannulation within 10 min. Log-rank test P-value= At the end of 10 min, radial arterial cannulation was completed in 65% of the US group and 46% of the Doppler group.
British Journal of Anaesthesia  , DOI: ( /bja/aes383)
Copyright © 2013 The Author(s) Terms and Conditions