@article{
  author = {Pournaghash Tehrani, S. Said, Hamzehlouiyan, Mehrnoush},
  title = {Effects of Treatment Duration on Anxiety and  Depression Symptoms in Different Drug Addiction  Maintenance Treatment Programs},
  journal = {Psychological Research},
  year = {2010},
  volume = {13},
  number = {2},
  pages = {7-22},
  doi = {}
}