FitzGerald, Isabel, and Andrew Appelboam. “A Simple Device to Control Valsalva Manoeuvre Strain Pressure; A Letter to Editor”. Archives of Academic Emergency Medicine 6, no. 1 (November 21, 2018): e22. Accessed June 21, 2024. https://journals.sbmu.ac.ir/aaem/index.php/AAEM/article/view/65.