Baby deaths from suffocation should not be included in SIDS statistics for a start. Suffocation is not Sudden Infant Death Syndrome. How could any SIDS study possibly be accurate or lead to helping find more information for why babies die of SIDS when suffocation is included in the statistics? We don't include people who have cancer and die in car crashes in statistics on people who die from cancer.
SIDS has come up with absolutely no concrete evidence or info in how many decades as to why SIDS occurs. If they wish to promote safe sleeping then perhaps they should change their name and call their research safe sleeping not SIDS. If you take out all the advice that reduces suffocation then There is not much in there about SIDS at all.