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Detailed steps of Chen’s technique. (A) A first stitch was made on the posterior bronchial wall and knot made outside the lumen; (B) the deeper posterior quarter of the circumference was continuously sutured; (C) the superficial posterior quarter was sutured; (D) the tension of the thread was adjusted before suturing the other three quarters; (E) the anterior wall was continuously sutured in the same way; (F) making a final knot outside the lumen.
