Zhang Zhongjing (about150-219): Late Eastern Han Dynasty;

Hua Tuo (about 145-208): Late Eastern Han Dynasty;

Gu Kaizhi (348-409): Eastern Jin Dynasty;

Zu Chongzhi (429-500): Northern and Southern Dynasties.

Historical stages can be big or small. If the Wei, Jin, Southern and Northern Dynasties (220-589) are taken as the standard, then Wang Xizhi, Gu Kaizhi and Zu Chongzhi are people of the same period. Hua Tuo and Zhang Zhongjing were both famous doctors at the end of the Eastern Han Dynasty, and they were people of the same period.