Cluster 7: comprehend informed consent able sign document written willing subjects form 
Cluster 52: written informed consent given provides obtained able participate patient study 
Cluster 241: irb approved sign document informed understand consent willing written able 
Cluster 668: specific study entry consent informed provide prior patient sign patients 
Cluster 688: understand able sign consent informed document willing patients read patient 
Cluster 793: sign consent informed patients able willing written refusal document patient 
Cluster 861: legally authorized representative consent informed written provide patient sign understand 
Cluster 1008: document sign understand written consent willing informed able patient patients 
Cluster 1045: unwillingness inability consent informed supplementation written transfused vitamin individual folic 
Cluster 1058: guardians parents legal sign consent written informed patients benefits indicating 
Cluster 1554: able consent informed willing patients patient subjects study participants eligible 
Cluster 1583: pertinent aspects informed dated indicating signed document consent legally trial 
Cluster 1591: comply able protocol informed consent sign requirements signed willing icf 
Cluster 1602: inability consent informed provide understand written obtain assent document sign 
Cluster 2334: legal representative consent informed able written provide patient understand sign 
Cluster 2397: unwilling unable consent informed sign form document written patients icd