[1] UANL, Ctr Univ Canc, Monte Verde Juarez, Nl, Mexico
[2] Univ Autonoma Nuevo Leon, Ctr Univ Canc, Monterrey, Mexico
[3] Bayer Mexico, Mexico City, DF, Mexico
[4] Hosp Univ Jose Eleuterio Gonzalez, Serv Geriatria, Monterrey, Nl, Mexico
[5] Hosp Univ Jose Eleuterio Gonzalez, Ctr Univ Canc, Monterrey, Nl, Mexico