I lived in La Paz for 2 years, 1973-75. My best friend was Julio Cesar Castagnon Gomez. He was a medical student at the time. I returned once in 1980, and lost contact around 1983. He would be 69 years old. His father was an attorney. I believe they were moving from the city to Calacoto. I plan to visit Bolivia as soon as Covid is no longer a threat. Thank you for any information.