Assertion: calcium's number | /r/HasProperty | alderman et al
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Source sentences:
text: (Raman et al 1978) and there is no relationship between the number of previous pregnancies and bone mineral density (Alderman et al 1986, Koetting & Warlaw 1988, Kreiger et al 19832, Walker & Linkswiler 1972, Wasnich et al 1983) or fracture risk (Johansson et al 1993).