I first picked with up from a tweet from David Armstrong . Turns out that there is this entry in the Guiness Workd Records: Quote: The largest diabetic health screening at multiple locations involved 521 screenings by Kaiser Permanente, San Diego (USA) across 11 locations in San Diego, California, USA, on 17 March 2011. This particular screening examined patients’ feet for complications arising from previously diagnosed cases of diabetes .
See more here:
‘Diabetic foot’ record in the Guiness World Records