Authors: Sheffield, JVL Larson, EB

Citation: Jvl. Sheffield et Eb. Larson, Update in general internal medicine, ANN INT MED, 135(4), 2001, pp. 269-278

Authors: Sheffield, JVL Root, RK

Citation: Jvl. Sheffield et Rk. Root, Smoking and pneumococcal infection., N ENG J MED, 342(10), 2000, pp. 732-734