I want to teach in China for just one term, just short of 6 months, will I need a medical check?

I have been to China before, on several occasions, always needed medical checks both here at home and once I applied for the residence visa in China. Would like to know if I Have to go through the same process if I want to teach there on a contract of just one term, just short of 6 months? Also, can I teach on an F- visa, or should it be a Z- visa? Info will be appreciated!