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Serum folate concentrations, asthma, atopy, and asthma control in Peruvian childrenNicholson, Andrew; Pollard, Suzanne L.; Lima, John J.; Romero, Karina M.; Tarazona-Meza, Carla; Malpartida-Guzmán, Gary; Mougey, Edward; Hansel, Nadia N.; Checkley, William · Respiratory Medicine · 2017