1Hossein-Zadeh-e-Nik T, Mapar P.An evaluation on the necessity for a cephalogram in natural head position (NHP) for the diagnosis of theseverity and direction of malocclusion[J].J Dental Medicine,20ll, 15(1):38-41.
2Gramstad G, Sears B,Marra G.Variation of tension in the long head of the biceps tendon as a function of limb position with simulated biceps contraction[J].Inter J Shoulder Surg,2010,4(1):8-14.