Application of ultrasonic guided exploration of blood vessels without a needle guide in peripherally inserted central catheter placement (超声纵向探查血管脱离导针器穿刺技术在PICC置管中的应用) - LU Zeling (卢泽玲); LIN Han (林翰); WU Qiuxia (巫秋霞) (中西医结合护理, 2022)