[1] Inst Portugues Oncol Francisco Gentil, Lisbon, Portugal
[2] Catolic Lisbon Sch Business & Econ, Lisbon, Portugal
[3] Univ Lisbon, Ctr Evidence Based Med, Fac Med, P-1699 Lisbon, Portugal
[4] Ctr Hosp Univ Coimbra, Coimbra, Portugal
[5] Hosp Garcia de Orta, Lisbon, Portugal
[6] Ctr Hosp Lisboa Norte, Lisbon, Portugal