You should not read this document not as a "walk-through" for your setup but as a design guide to devellop a complex solution.
It's a very nice document, but maybe it goes too deep for the question at hand.
It DOES describe the situation you are looking for
1) public WLAN for internet access
2) private WLAN for doctors
(3) private WLAN for VoIP
....)
the section "Overview: PCU Medical Center" is described as "Example WLAN Installation"
>>> As you read through this chapter, assume that you are a part of a team of
wireless networking experts who have been hired by the university to help
PCUMC develop a wireless solution.
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....
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The hospital also wants to provide Internet access for visitors and patients in
the hospital and office building as well as wireless access to the university
network for students and instructors in the office building. The hospital wants
to provide doctors who have offices in the office building with wireless access
to the ERS.
To complement the existing voice-over-IP (VoIP) system, PCU would like to
offer wireless VoIP (VoWLAN) service campus-wide, including the office
building and hospital. <<<
Sections about coverage you may choose to skip. Sections about security can be helpfull to realize a secure solution.
