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	1.	Sex steroids do not alter melatonin secretion in the human. [electronic resource] by Delfs, T M Baars, S Fock, C Schumacher, M Olcese, J Zimmermann, R C Producer: 19940630 In: Human reproduction (Oxford, England) vol. 9 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	24-hour profiles of salivary progesterone. [electronic resource] by Delfs, T M Klein, S Fottrell, P Naether, O G Leidenberger, F A Zimmermann, R C Producer: 19941118 In: Fertility and sterility vol. 62 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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