Signaling via ErbB2 and ErbB3 Associates with Resistance and <i>Epidermal Growth Factor Receptor</i> (<i>EGFR</i>) Amplification with Sensitivity to EGFR Inhibitor Gefitinib in Head and Neck Squamous Cell Carcinoma CellsKaisa Erjala, Klaus Elenius|Clinical Cancer Research|2006Cited by 265