19bec0cb_ocess___Cancer_Guidelines_Wiki__Prognosis
[Level] III-1 [Intervention] A pseudo-randomised controlled trial (i.e. alternate allocation or some other method) [Diagnosis] A study of test accuracy with: an independent, blinded comparison with a valid reference standard, among non-consecutive patients with a defined clinical presentation [Aetiology] All or none [Screening] A pseudo-randomised controlled trial (i.e. alternate allocation or some other method) [Prognosis] 
All or none
Guideline development process - Cancer Guidelines Wiki
Prognosis