Hugely disappointing explanation. Did corrupt big pharma buy Khan institute as well? Perhaps khan institute is not up to date that the second Doctor co-authorizing the Wakefield study actually appealed all the way to the high courts and won the case that no malpractice had occurred in the "Wakefield Study" study and received his medical license back. As well, it was declared by the presiding judge that the Lancet paper authored by the Wakefield and 12 other prestigious researchers, should be re-published and that the entire Wakefield case had been handled unjustly. Andrew Wakefield has also since been vindicated scientifically by 6 independent research teams from different countries, all having been able to replicate Wakefield's findings, showing he was RIGHT to suggest that more research into links between autism, MMR and IBS is needed. Andrew Wakefield, produced a profound film, VAXXED, which has supported a huge wake up movement around the world. Highly educated doctors, chiropractors, health practitioners, mothers, fathers, are waking up to the reality that there is massive fraud being perpetrated in Big Pharma and government regulatory agencies. People are discovering that we MUST question the safety of vaccines.