Soldiers from Netherlands' Van Speijk vessel observe acupuncture treatment on Chinese People's Liberation Army Navy hospital ship "Peace Ark" in Gulf od Aden, July 14, 2013. It was the first time PLA Navy hospital ship "Peace Ark" provided medical treatment for foreign soldiers during its 10-day mission to Gulf of Aden. Photo: Xinhua

Medical personals on Chinese People's Liberation Army Navy hospital ship "Peace Ark" wave to soldiers from Netherlands' Van Speijk vessel in Gulf od Aden, July 14, 2013. It was the first time PLA Navy hospital ship "Peace Ark" provided medical treatment for foreign soldiers during its 10-day mission to Gulf of Aden. Photo: Xinhua

A sailor from Netherlands' Van Speijk vessel receives dental operation on Chinese People's Liberation Army Navy hospital ship "Peace Ark" in Gulf od Aden, July 14, 2013. It was the first time PLA Navy hospital ship "Peace Ark" provided medical treatment for foreign soldiers during its 10-day mission to Gulf of Aden. Photo: Xinhua