Authors: Popli, RK Helm, JF

Citation: Rk. Popli et Jf. Helm, Endoscopic images in cricopharyngeal dysfunction, GASTROIN EN, 54(6), 2001, pp. 752-752

Authors: Helm, JF Russo, MW Biddle, AK Simpson, KN Ransohoff, DF Sandler, RS

Citation: Jf. Helm et al., Effectiveness and economic impact of screening for colorectal cancer by mass fecal occult blood testing, AM J GASTRO, 95(11), 2000, pp. 3250-3258

Authors: Helm, JF Sandler, RS

Citation: Jf. Helm et Rs. Sandler, Colorectal cancer screening, MED CLIN NA, 83(6), 1999, pp. 1403