All ten homeopaths recommended homeopathy as a substitute. Some homeopaths (particularly those who are non-physicians) advise their patients against immunization. Not all homeopaths advocate extremely high dilutions. In the 1950s, there were only 75 pure homeopaths practising in the U.S. Johnson asked homeopaths and company representatives about cures for cancer and vaccine claims. The process of dilution and succussion is termed "dynamization" or "potentization" by homeopaths. Cases of homeopaths advising against the use of anti-malarial drugs have been identified. The CCH also regulates the practice of registered homeopaths. In 2009 there were approximately 2,000 homeopaths, who are not GPs, registered with various organisations. Stevens does not want the Society of Homeopaths to be reaccredited. By contrast, the notion of "memory of water" has been taken seriously among homeopaths. In 2013 the prize was awarded to the organisation "Homeopaths Without Borders".