%0 Case Reports %T Cardiac Ultrasound Image Disappearance in the Precordial Area as a New Specific Ultrasound Sign for Diagnosing Neonatal Pneumothorax and Precardiac Thoracentesis Therapy: A Retrospective Case-Control Study. %A Liu J %A Yan W %A Yang JW %A Fu W %J Arch Bronconeumol %V 59 %N 2 %D 02 2023 %M 36175274 %F 6.333 %R 10.1016/j.arbres.2022.07.018 %X