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Caption: (PX4)PHILADELPHIA, APRIL 10--INTERNATIONAL MEDICAL DISCUSSION- Russia's Dr. Vasili V. Parin, right, one of the Soviet's space medicine experts, discusses use of a plastic cast of lung arteries with Dr. Ernst O. Attinger, research director of Philadelphia Presbyterian Hospital today as start of a medical symposium. Parin won the Order of Lenin on his 60th birthday this month "in recognition of his contribution to the advancement of Soviet medical science.".