This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
The strip technique which is a variant of free gingival graft was developed by 
Select and explain. 
A. Rateit-Schak et.al, B. Han et.al, C. Edel et.al, D. Bjorn et.al
B: Han et.al
Answer: B: Han et.al 
Explanation: None