What is the exact reason for sagging cheeks?
 
It seems like people at different hospitals have slightly different opinions.
 
Some say it's because the cheekbones aren't properly fixed, causing the bones to sag downwards. So,
 
as long as the cheekbones are properly fixed, there's almost no chance of them sagging?
 
I wonder if there are any people who have sagging cheeks even though the surgery went well.
 
Are there any papers or other data on the reasons for sagging cheeks?