Medical experts and a patient's group called for screening of atrial fibrillation at primary care sector to prevent patients' risk of stroke. (L to R) Professor David Siu Chung-wah from University of Hong Kong's department of medicine Yuen Siu-lam, chairm

Medical experts and a patient's group called for screening of atrial fibrillation at primary care sector to prevent patients' risk of stroke. (L to R) Professor David Siu Chung-wah from University of Hong Kong's department of medicine Yuen Siu-lam, chairman of Self Help Group for the Brain Damaged; and Professor Lawrence Wong Ka-sing, Emeritus Professor from Chinese University's department of medicine and therapeutics. 12SEP17. SCMP/ Elizabeth Cheung (Photo by Elizabeth Cheung/South China Morning Post via Getty Images)