Typically, yes they are.
All 43 positions get paid.
A resident doctor can switch residencies but will need permission from numerous people at both hospitals. There may not be any positions open where they are wanting to go and they may have to wait until one becomes available.
Yes, medical students do get paid for their residencies. I've heard that they are paid roughtly the same as a school teacher's salary.
There are very few paid positions (full time) Their website says they are no paid positions open, and all other crew members are volunteers, who are unpaid.
Paid employment refers to job positions that are compensated with wages and salaries.
Alternative medicine practioners should not get paid as much as regular doctors.
M: Primary care categorical positions offered by some medicine and pediatrics programs
EMS persons get paid very little for what they are expected to do and know.
Residencies
Depends on their job. Those are government positions, and staff are paid the rate for their positions. It will also vary by a cost-of-living factor in different places.
Young doctors just out of medical school usually. During their internship and residencies they are exposed to different aspects of medicine. It gives them a chance to experience a wide range of specialties and they can decide which would be best for them.
Non-profit organization do have some paid positions within them, though most who work with these organizations are on a volunteer basis.