@article {ioannidis2001comparison,
	title = {Comparison of evidence of treatment effects in randomized and nonrandomized studies},
	journal = {Jama},
	volume = {286},
	number = {7},
	year = {2001},
	pages = {821{\textendash}830},
	publisher = {American Medical Association},
	author = {Ioannidis, John PA and Haidich, Anna-Bettina and Pappa, Maroudia and Pantazis, Nikos and Kokori, Styliani I and Tektonidou, Maria G and Contopoulos-Ioannidis, Despina G and Lau, Joseph}
}
