Cluster 56: swallow oral able medications patients patient reliably tolerate capsules absorb Cluster 357: oral medications ability swallow unable receive tolerate patients existing record Cluster 555: tolerate inability able unable mri patients ascorbate oral position flexible Cluster 1980: claustrophobia severe anxiolytics unresponsive inability history scanning tolerate oral symptomatic Cluster 2175: ability medication oral swallow dosage impaired receive patients form solid Cluster 2305: tablets swallow ability oral retain difficulty acetate abiraterone patients tolerate