Najafidolatabad, Shahla, Malekzadeh Janmohamad, and Zinat Mohebbinovbandegani. 2010. “Comparison of the Pain Severity, Drug Leakage and Ecchymosis Rates Caused by the Application on Tramadol Intramuscular Injection in Z-Track and Air-Lock Techniques”. Investigación Y Educación En Enfermería 28 (2). https://doi.org/10.17533/udea.iee.6385.