RT Journal T1 Double Roots of Mandibular Premolar in Full-mouth Periapical Films A1 Ling-jia Kong, Kuo Wan, Deng-gao Liu PB Chinese Medical Sciences Journal FD 2015-10-02 YR 2015 JF Chinese Medical Sciences Journal JO Chinese Medical Sciences Journal VO 30 IS 3 SP 174 DO 10.1016/S1001-9294(15)30043-2 K1 first mandibular premolar;second mandibular premolar;double roots;full-mouth periapical film LK {http://cmsj.cams.cn/EN/article/article_286.shtml}