Water hardness and eczema at 1 and 4 y of age in the INMA birth cohort. - Font-Ribera, Laia; Gracia-Lavedan, Esther; Esplugues, Ana; Ballester, Ferran; Jiménez Zabala, Ana; Santa Marina, Loreto; Fernández-Somoano, Ana; Sunyer, Jordi; Villanueva, Cristina M. (Environmental Research, 2015)