In one embodiment, the system and method allows {HEAD ~ investigators} to contact {TAIL ~ participants} without disclosing confidential contact information of the participants to the investigators by storing health information and contact information in separate databases 
to contact
In one embodiment , the system and method allows { HEAD ~ investigators } to contact { TAIL ~ participants } without disclosing confidential contact information of the participants to the investigators by storing health information and contact information in separate databases
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH