1 Department of Stomatology, Shengli Oilfield Central Hospital, Dongying, 257034, PR China; National Standardized Residency Training Base, Shengli Oilfield Central Hospital, Dongying, 257034, PR China.
2 Department of Pharmacy, Shengli Oilfield Central Hospital, Dongying, 257034, PR China.
3 Department of Stomatology, Shengli Oilfield Central Hospital, Dongying, 257034, PR China; National Standardized Residency Training Base, Shengli Oilfield Central Hospital, Dongying, 257034, PR China. Electronic address: zxyykqzm@163.com.