RT - Journal Article T1 - Letter to the Editor JF - ijpcp YR - 2012 JO - ijpcp VO - 18 IS - 2 UR - http://ijpcp.iums.ac.ir/article-1-1615-en.html SP - 167 EP - 167 AB - Letter to the Editor LA eng UL http://ijpcp.iums.ac.ir/article-1-1615-en.html M3 ER -