Long-term results of photodynamic therapy with 5-aminolevulinic acid for superficial Barrett's cancer and high-grade intraepithelial neoplasia by Pech, Oliver, MD, Gossner, Liebwin, MD, PhD, May, Andrea, MD, PhD, Rabenstein, Thomas, MD, PhD, Vieth, Michael, MD, PhD, Stolte, Manfred, MD, PhD, Berres, Manfred, PhD, Ell, Christian, MD, PhD

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