Funding:21T This study was funded by the 90P
th PAnniversary of
Chulalongkorn University Fund (Ratchadaphiseksomphot
Endowment Fund)” and Chulalongkorn University Graduate
Scholarship to commemorate the 72P
nd PAnniversary of his
Majesty King Bhumibol Adulyadej, Chulalongkorn University
21TCompeting interests21T: None declared
21TEthical approval:21T All research was approved by ethical
committee of the faculty of engineering, Chulalongkorn
University.