If you want to take the subway to the Fourth Affiliated Hospital of Nanjing Medical University, you can follow the following steps:

1. Take Nanjing Metro Line 2.

2. Get off at the Fourth Affiliated Hospital of Nanjing Medical University.

Walk about 300 meters south and you can reach the Fourth Affiliated Hospital of Nanjing Medical University.

I hope the above information can help you reach the Fourth Affiliated Hospital of Nanjing Medical University smoothly.