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De Benedetti F, Massa M, Pignatti P, Albani S, Novick D, Martini A

doi: 10.1016/j.nutres.2018.07.005

That said, theres some controversy on this the American Academy of Dermatology says salicylic acid may be safe to use for a limited time during pregnancy

Trends in adult body-mass index in 200 countries from 1975 to 2014: A pooled analysis of 1698 population-based measurement studies with 192 million participants (in Eng)
Ritz et al., 2000

Dual-method testing