Table 2 . Top 5 Iranian Biomedical Research Centers according to number of publications and citations in WOS between 1991 and 2010 .

IBRCs	Number of publications	%	IBRCs	Number of citations	%
Drug Applied Research Center of Tabriz UMSs	408	17.24	Royan Institute	1197	16.70
Royan Institute	362	15.30	Drug Applied Research Center of Tabriz UMSs	1156	17.29
Iranian Blood Transfusion Organization	180	7.61	Pharmaceutical Research Center of Mashhad UMSs	1142	5.08
Biotechnology Research Centerof Tabriz UMSs	125	5.28	Medical Nanotechnology Research Center of Terhan UMSs	480	4.04
Pharmaceutical Research Center of Mashhad UMSs	113	4.78	Medical Biology Research Center of Kermanshah UMSs	362	10.72