James Reynolds

and Marie Boudef is in Cleveland, Ohio.

She's the medical director of one of the largest lung transplant and heart-lung transplant programs in the United States.

During that surgery, you're obviously responsible for the overall medical management of the patient, but the surgery is conducted by a surgeon.

What do you do during the surgery?

I see.

And given what you've explained to me about your role before, during and after a transplant, presumably you also have to be an expert in human psychology as well for the patient and for their family.

Dr. Gheravasi, what kind of contact, if any, are you allowed with the family of the person whose lungs are used in a transplant?

Dr. Budev, what are the rules in the United States?

lung transplant physicians Dr Vicky Gerovasili and Dr Marie Boudef.

Our thanks to them and to our other guests, Natalia and Amy, for sharing their experiences this week.

I'm James Reynolds.

You've been listening to the documentary from the BBC World Service.

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I'm James Reynolds.

Welcome to the documentary from the BBC World Service.

This time in BBC Conversations, World Cup superfans share their passion for the game and we bring together excited football supporters whose countries have qualified for the first time.

The FIFA Men's Football World Cup is underway now in Mexico, the US and Canada.

Over the next five weeks, 48 teams will play a total of 104 matches across 16 stadiums.

In the run-up, as usual, the most watched sporting event in the world has not been without its controversies, from high ticket prices and transport costs to rows over visas and concerns about security.