Amendment of the OMERACT ultrasound definitions of joints’ features in healthy children when using the DOPPLER technique oleh P. Collado, D. Windschall, J. Vojinovic, S. Magni-Manzoni, P. Balint, G. A. W. Bruyn, C. Hernandez-Diaz, J. C. Nieto, V. Ravagnani, N. Tzaribachev, A. Iagnocco, M. A. D’Agostino, E. Naredo, on behalf of the OMERACT ultrasound subtask force on pediatric