The Dutch champion crashed in the final 500 meters of Wednesday's Nokere Koerse.
Etiquette in cycling races is mysterious and confusing. What can we learn from the latest incident between Kris Boeckmans and Justin Jules?
Belgium loses its second event of the season, after Kuurne-Brussel-Kuurne lost in February due to snow
Jens Keukeleire, 21, has already won Three Days of West Flanders and Le Samyn this year.