I need to echo that EFR is not even close to the healthcare industry standard as far as choosing an agency. I will say that American Heart, Red Cross, ASHI are widely recognized and used. If you are looking to expand your abilities as a CPR instructor, you may want to consider crossing over to an instructor in one of those agencies then go from there.
In addition, ILCOR, international liasion committee on resuscitation works hand in hand with AHA to develop those cardiovascular care guidelines that all the other agencies pull from. The following agenices sit on the ILCOR committee:
The International Liaison Committee on Resuscitation (ILCOR) was formed in 1992 to provide a forum for liaison between principal resuscitation organisations worldwide. Although the criteria for participation were not closely defined, member organisations were expected to have an accepted remit for creating resuscitation guidelines, preferably for more than one country, and to be multidisciplinary in membership. At present, ILCOR comprises representatives of
American Heart Association (AHA)
European Resuscitation Council (ERC)
Heart and Stroke Foundation of Canada (HSFC)
Australian and New Zealand Committee on Resuscitation (ANZCOR)
Resuscitation Councils of Southern Africa (RCSA)
Inter American Heart Foundation (IAHF)
Resuscitation Council of Asia (RCA - current members Japan, Korea, Singapore, Taiwan).
In addition, this is a statement about ILCOR:
ILCOR meets twice each year usually alternating between a venue in the United States and a venue elsewhere in the world. In collaboration with the AHA, ILCOR produced the first International CPR Guidelines in 2000 and an International Consensus on CPR and ECC Science with Treatment Recommendations in 2005. Once again, in collaboration with the AHA, ILCOR is now co-ordinating an evidence-based review of resuscitation science, which will culminate in a Consensus Conference in February 2010. The proceedings of this meeting, to be published in October 2010, will provide the material for regional resuscitation organisations, such as the ERC, to write their resuscitation guidelines.
So perhaps the best choice if you want to be on the cutting edge of healthcare as it relates to CPR would be to choose AHA or since you mentioned SE asia, RCA. Heck go for both!