<prompt> The use of cervical vertebrae as skeletal maturity indicators was given by:BenninghoffHassel and FarmanWolffBrodie  <response>: The shapes of the cervical vertebrae differ at each level of skeletal development, and this helps to determine the skeletal maturity of a person. This is the basis of Hassel and Farman system of evaluating skeletal maturity using cervical vertebrae. 