iraj golikhatir emergency department, imam khomeini hospital, mazandaran university of medical sciences, sari, iran. seyed hossein montazer emergency department, imam khomeini hospital, mazandaran university of medical sciences, sari, iran. nabiollah bagheri emergency department, imam khomeini hospital, mazandaran university of medical sciences, sari, iran. fatemeh jahanian emergency department, imam khomeini hospital, mazandaran university of medical sciences, sari, iran. farzad bozorgi emergency department, imam khomeini hospital, mazandaran university of medical sciences, sari, iran. seyed mohammad hosseininejad emergency department, imam khomeini hospital, mazandaran university of medical sciences, sari, iran.