Esteban-Garrido, E., A. Hernández-Núñez, B. Echeverría-García, F.E. Rojas-Farías, and J. Borbujo. 2019. “Ultrasound Appearance of a Sucking Knuckle Pad. An Update.”. European Journal of Pediatric Dermatology 29 (1):20-22. https://doi.org/10.26326/2281-9649.29.1.1943.