Methodological rigor in both targeted neonatal echocardiography training and study design are essential to understanding the impact of ultrasound on neonatal pain
*Corresponding Author:
Regan E. Giesinger, 200 Hawkins Drive, Iowa City, IA, 52242, USA. Tel.: +1 319 356 7314; Fax: +1 319 356 4685; E-mail: regan-giesinger@uiowa.edu.
