US Navy hospital ship treats Venezuelan migrants, Colombians

U.S. military doctors line up as they leave the public school where they attended patients in Riohacha, Colombia, Monday, Nov. 26, 2018. The USNS Comfort is in Colombia as part of a mission to treat local residents and Venezuelas who require urgent medical attention. (AP Photo/Fernando Vergara)

Saray Barrios, a Venezuelan who said she arrived to Colombia three years ago with her parents, receives free dental treatment at a public school hosting U.S. doctors from the USNS Comfort hospital ship in Riohacha, Colombia, Monday, Nov. 26, 2018. The USNS Comfort is in Colombia as part of a mission to treat local residents and Venezuelas who require urgent medical attention. (AP Photo/Fernando Vergara)

Elvis Trazadania, from Venezuela, receives free dental treatment at a public school hosting U.S. doctors from the USNS Comfort hospital ship in Riohacha, Colombia, Monday, Nov. 26, 2018. The USNS Comfort is in Colombia as part of a mission to treat local residents and Venezuelas who require urgent medical attention. (AP Photo/Fernando Vergara)

RIOHACHA, Colombia — Venezuelan migrants aboard a U.S. Navy hospital ship were undergoing surgery Tuesday for everything from tooth extractions to hernias that have proven difficult to treat both in the country they fled and the one receiving them.

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