participant "Patient Registry" as PR

control "Match-Connect" as MC

control "Search & Match\nService" as SM

participant "Donor Registry" as DR

skinparam SequenceMessageAlign center

== Register Patient ==

PR -> SM : Send Patient

SM -> PR : Return WMDA PID

== Modify Patient ==

PR --> SM : Update Patient

PR --> SM : Assign User To Patient

== Retrieve Patient(s) ==

PR -> SM : Retrieve Patients

SM -> PR : Return One or More Patients

== Making Requests ==

PR -> SM : Update Patient Status (ACT)

PR -[#blue]> DR : Request a Donor (patient embedded)

PR -[#blue]> DR : Update Registered Patient