I want to know the answer to the following question:
Who defined a common External Power Supply for use with smartphones sold?
All the background I'm provided with is that "The European Standardisation Bodies CEN, CENELEC and ETSI (independent of the OMTP/GSMA proposal) defined a common External Power Supply (EPS) for use with smartphones sold in the EU based on micro-USB.". Is that enough to answer the question?