Epidemiology and Biostatistics Unit at the Antoine Lacassagne Center, Nice, France.|Antoine Lacassagne Center, Nice, France.|Antoine Lacassagne Center, Nice, France.|University of Nice, France.|University of Nice, France.|Centre Le´on Be´ rard, Lyons, France.|Pitie´-Salp^etrie`re Hospital in Paris, France.|Institute Curie of Paris, France.|Antoine Lacassagne Center, Nice, France.|Molecular and Cellular Pharmacology Institute of Sophia Antipolis, Valbonne, France.|Antoine Lacassagne Center, Nice, France.