Frailty Index associates with GRIN2B in two representative samples from the United States and the United Kingdom. - Mekli, Krisztina; Stevens, Adam; Marshall, Alan D.; Arpawong, Thalida E.; Phillips, Drystan F.; Tampubolon, Gindo; Lee, Jinkook; Prescott, Carol A.; Nazroo, James Y.; Pendleton, Neil (PLoS ONE, 2018)