Reference intervals for B-esterases in gull, Larus michahellis (Nauman, 1840) from Northwest Spain: influence of age, gender, and tissue. - Morcillo SM; Perego MC; Vizuete J; Caloni F; Cortinovis C; Fidalgo LE; López-Beceiro A; Míguez MP; Soler F; Pérez-López M (Environmental science and pollution research international, 2018)