Cluster 45: document willingness understand sign ability written informed consent subject subjects 
Cluster 584: understand ability informed consent provide willingness written nature signed study 
Cluster 694: participate study consent willing patients informed patient refuse willingness ability 
Cluster 704: ability consent informed willingness donor patients lack demonstrate precludes likely 
Cluster 705: voluntarily understand ability informed consent sign form document willingness fanca 
Cluster 776: sign willingness understand ability written informed consent subjects registration patients 
Cluster 1877: consent informed patients capacity willingness documented refuses assent subjects understand 
Cluster 2173: competent mentally consent informed sign understand form willingness ability irb 
Cluster 2351: sign willingness form understand ability consent informed written study initiation