create 2nd input in sidebar by flexdashboard

Hi Team,
I’m trying to create inputs sidebar in flexdashboard.
Now, I can create a hospital name into drop-down list by following code:

Sidebar {.sidebar}

Select a hospital to display:

Hospital_name <- rev(unique(mytest$hospital))
selectInput(“Hospital_name”, label = “Hospital name for … ”,
                       choices = Hospital_name, selected = Hospital_name[[1]])

My question is: I need to create a Department name into second drop-down list. It will show the department name in the list after selecting a hospital. Since the difference hospital may has different department name, I need to create the list from department column from the mytest data frame.
Could you give me some instructions about the second list?

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