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Other researchers and clinicians who worked with the theory that bacteria could cause cancer, especially from the 1930s to the 1960s, included Eleanor Alexander-Jackson, William Coley, William Crofton, Gunther Enderlein, Franz Gerlach, Josef Issels, Elise L'Esperance, Milbank Johnson, Arthur Kendall, Royal Rife, Florence Seibert, Wilhelm von Brehmer, and Ernest Villequez.