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@Oliver Schick
Most definitely not 'the most common cause' but a very common cause. Without having stats, I would say that injudicious left turns by motor vehicles (right turns in right-hand traffic countries) will top the table every time.
You can get stats (where it's been recorded) from the London Accident (sic) Analysis Unit, part of TfL's London Road Safety Unit. There's no separate statistical category for them but they should be searchable. Beware of a likely high degree of under-reporting, though.
I don't have up-to-date numbers as it's quite clear that people should stay out of door zones, anyway, for reasons above and beyond the crash risk, and that street design should always take account of it. No need to be pressed into quoting numbers for something so clear-cut, although if you want to shore yourself up, you can always look for them. Just looked, there's a Wikipedia page, but that's also quite threadbare on the stats front.
http://en.wikipedia.org/wiki/Door_zone