There are several ways of searching for Japanese partner(s)/counterpart(s) in each CRG, etc.
MEDLINE, EMBASE, LCMARC, JICST-E, etc. contain papers written by Japanese authors. To search/find Japanese in each topic, limit search to: (1) author’s institution in Japan, or (2) language used is Japanese.
There are two --
A special discussion group for Cochrane Collaboration opened since 27 October 1995 in the FDRUG (Forum for Drug) of the NIFTYSERVE. You may send a short message to Dr. K.Tsutani ( tsutani.cph@mri.tmd.ac.jp ), Chairman of JANCOC, who will forward the message to the "JAPANESE-WANTED" discussion group of FDRUG. Interested Japanese experts/institutions will respond to your message directly.