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Fifty micrograms of basic fibroblastic growth factor (bFGF) dissolved in 0.5 mL saline are injected and spread into the superficial lamina propria (SLP). A 23‐gauge injection needle is used under transnasal fiberscopic monitoring of the larynx (A) before and (B) after the injection of the right vocal fold, and (C) before and (D) after the injection of the left vocal fold. The bFGF is injected into the SLP as if inflating a balloon.
