Margulis AV, Pladevall M, Riera-Guardia N, Varas-Lorenzo C, Hazell L, Berkman ND, Viswanathan M, Perez-Gutthann S. Quality assessment of observational studies in a drug-safety systematic review, comparison of two tools: the Newcastle-Ottawa Scale and the RTI item bank. Clin Epidemiol. 2014 Oct 10;6:359-68. doi: 10.2147/CLEP.S66677
Hahn KA, Hatch EE, Rothman KJ, Mikkelsen EM, Brogly SB, Sorensen HT, Riis AH, Wise LA. Body size and risk of spontaneous abortion among Danish pregnancy planners. Paediatr Perinat Epidemiol. 2014 Sep;28(5):412-23. doi: 10.1111/ppe.12142