García-Eslava, Jairo Santiago, Julián E. Barahona-Correa, Diego Alberto Moreno, and Antonio Bonilla. 2018. “Usefulness of Ultrasound: Intrathecal Pump Refill in the Management of Chronic Pain. A Case Report”. Colombian Journal of Anesthesiology 46 (1):68-71. https://www.revcolanest.com.co/index.php/rca/article/view/329.