| 31. | Sperm and eggs are frozen for storage, as are heart valves.
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| 32. | He died in Munich in 2004, during a heart valve operation.
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| 33. | The actor had surgery in 1997 to replace a heart valve.
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| 34. | But heart valve problems are not the only worry with fen / phen.
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| 35. | The company develops heart devices including catheters and heart valves.
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| 36. | You cannot ensure the clean heart valve will remain clean.
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| 37. | _McMillan, 48, had a heart valve replacement in June 1994.
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| 38. | Much later, in 1996, he had heart valve replacement surgery.
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| 39. | In 2007, Banks underwent surgery for a faulty heart valve.
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| 40. | Q . At present, humans receive heart valves from pigs.
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