Study: https://www.bmj.com/content/bmj/366/bmj.l2408.full.pdf https://www.bmj.com/content/bmj/366/bmj.l2408.full.pdf (via https://www.bmj.com/content/366/bmj.l2

Study: https://www.bmj.com/content/bmj/366/bmj.l2408.full.pdf https://www.bmj.com/content/bmj/366/bmj.l2408.full.pdf (via https://www.bmj.com/content/366/bmj.l2408 https://www.bmj.com/content/366/bmj.l2408).