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Thai Crown Prince Maha Vajiralongkorn rides his bicycle as he takes part in a campaign 'Bike for Mom' to celebrate the role of his elderly mother Queen Sirikit in Bangkok on August 16, 2015. Thailand's Crown Prince led tens of thousands of blue-clad cyclists through Bangkok in a rare high-profile public appearance amid anxiety over the health of the ailing king. AFP PHOTO / PORNCHAI KITTIWONGSAKUL (Photo credit should read PORNCHAI KITTIWONGSAKUL/AFP/Getty Images)

Thai Crown Prince Maha Vajiralongkorn rides his bicycle as he takes part in a campaign 'Bike for Mom' to celebrate the role of his elderly mother Queen Sirikit in Bangkok on August 16, 2015. Thailand's Crown Prince led tens of thousands of blue-clad cyclists through Bangkok in a rare high-profile public appearance amid anxiety over the health of the ailing king.     AFP PHOTO / PORNCHAI KITTIWONGSAKUL        (Photo credit should read PORNCHAI KITTIWONGSAKUL/AFP/Getty Images)