I am trying to writing paper on PICOT question of Do youths with ADHD benefit from combination therapy (pharmacological/behavioral) to control

I am trying to writing paper on PICOT question of Do youths with ADHD benefit from combination therapy (pharmacological/behavioral) to control symptoms of inattention, hyperactivity and impulsivity compared to no intervention within 6 months? 

What I am struggling with is questions related to the feasibility of this research project.