Hey! I agree with what gladifimakeit said, for personal dialogue send private messages, but I think that this is a valid question that people may be interested in so I'll answer on here. One of the people that I spoke to at Emory actually said that they didn't know it was a 4 semester program until they got there last fall!!! Haha, it happens to the best of us.
I doubt I know more about Emory than many other accepted students, and a current student may be able to shed more light on this (like JMM), however, I was told that Global Health is only available in the 4 semester format. I was told that the shorter, 3 semester, option was only usable for HPM, EPI, and Global EPI. That was also reflected in the acceptance packet (in mine it's on page 24).
If 3 semesters is a make or break situation for you you could always call Emory and see if they make any exceptions...If time is the issue you may be able to do a Fall, Spring, Summer, Fall (being done in 1.5 years with 4 semesters) - I don't know for sure that this is an option, but it seems reasonable...if it's price, the price for 3 semester programs is 17,700 per semester and only 13,200 a semester for 4 semester programs, so the totals: 53,100 and 52,800 respectively actually make the 4 semester program slightly cheaper (although, economically - more time out of the workforce, additional loans for rent, etc for an extra semester - it might be more expensive depending on your situation).
Good luck!