Yu Jiajun is a doctor in Qishan village, Lu'an city in east China's Anhui province.
Yu graduated from a medical school in 1999, and has since been a doctor in the medical service station in his hometown Qishan Village.
The village, located in a reservoir region, comprises several isolated islands, rendering transportation a big problem for the 300 or so households living on the islands.
In order to provide more timely medical treatment for the villagers, Yu and his wife Wu Qijiao, who's also a medical graduate, decided to move their home on the boat and established a "floating" medical service station on the water. In addition to examining patients at the medical station, Yu also provide door-to-door medical service for villagers who have difficulty to travel.
In the past 15 years, Yu treated more than 18,000 cases, over 5,000 of which were free door-to-door services, prompting local villagers to call him "doctor on the boat".