Hygiene, atopy and wheeze–eczema–rhinitis symptoms in schoolchildren from urban and rural Ecuador
Philip J Cooper, Maritza Vaca, Alejandro Rodriguez, Martha E Chico, Darci N Santos, Laura C Rodrigues, Mauricio L Barreto
Thorax Mar 2014, 69 (3) 232-239; DOI: 10.1136/thoraxjnl-2013-203818