2. They definitely will receive medical training, and will have remote support from experienced doctors on earth.
So let me see if I've got this right.
Suddenly one evening while Dave and Chris are relaxing in their base craft, Chris grabs his stomach and begins writhing in pain. Dave rushes to his side and helps him lie down. Next he gets a glass of water for Chris to drink (he's seen that done in movies many times). Dave takes Chris's vital signs (as he was trained to do) then radios them back to Earth along with a verbal report of Chris's symptoms.
While waiting for the radio signal to travel the distance from Mars to Earth then back again, Dave gives Chris a little more water and searches through the medical database to find out what he should do. But he is interrupted when Chris begins to vomit. Before the communication from Earth can arrive, Chris has turned blue, stopped breathing, and died.
Just as Dave is breaking out a body bag, the response from earth arrives - 32 minutes from when it was sent. It reads,
"Message received. We're working on it. Whatever you do, don't let him lie down, and for God's sake, don't give him anything to drink".
Is that what you mean when you say, "remote support from experienced doctors on earth"?