(This is part one of a five-part series examining Canada's health care crisis. How we got here, what comes next, and what we can do about it.)Nurses are almost everyone's first point of contact with our health care system. And if you need extensive care, they will be your most reliable caregivers. But they're quitting. In droves. And without them, well, things like hospitals and long-term care facilities don't actually work.What's causing the mass exodus? What can we do to stop it? And what do people hoping to enter the nursing profession need to make an impact when they get here?GUEST: Natalie Stake-Doucet, former practicing nurse, Faculty Lecturer and PhD, Université de Montréal