1 Taiwan's National Health Insurance Research Database: Administrative Health Care Database as Study Object in Bibliometrics Yu-Chun Chen a , Hsiao-Yun Yeh b , Jau-Ching Wu c , Ingo Haschler a , Tzeng-Ji Chen b,d , and Thomas Wetter a Correspondence to: Yu-Chun Chen, BM, MSc Department of Medical Informatics Heidelberg University, Im Neuenheimer Feld 305, Heidelberg 69120, Germany Email: Yu-Chun.Chen@stud.uni-heidelberg.de; cbrain@self.twmail.cc http://tinyurl.com/Yu-ChunChen Tel: +49-6221-56-7461 Fax: +49-6221-564997 _________________________ a Department of Medical Informatics, Heidelberg University, Heidelberg, Germany. b Department of Family Medicine, Taipei Veterans General Hospital, Taipei, Taiwan (R.O.C.). c Institute of Pharmacology, National Yang-Ming University, Taipei, Taiwan (ROC). d Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan (ROC).