Dear Feng Shu
On Thu, 04 Aug 2022 05:36:43 +0800
Feng Shu <tuma...@163.com> wrote:

> when patientA see doctors: home -> doctorA -> doctorB -> doctorC ->
> home

It's usually more related when a health professional sends the patient
to another physician... for example:

* A general practitioner (Doctor A) sees one patient and wants to rule
  out any heart condition, so she refers the patient to the
  cardiologist (Doctor B). 

        Derived from : Doctor A
        Derived to: Doctor B

Bests
Luis

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