2001, Cobleigh et al. 1999, Kuzur et al. 2000, Nicholson et al. 2000, Paik et al. 2008, Pegram et al. 2000, Pegram et al. 1997, Piccart-Gebhart et al. 2005, Romond et al. 2005, Seidman et al. 1999, Seidman et al.