full free access: Levothyroxine dose & risk of fractures in older adults: nested case-control study -- Women's College Hospital Toronto study (hypothyroidism)

Note:
the study excluded thyroid cancer survivors but a quick scan does not indicate a search of the database/inclusion/exclusion of a prior/present history of other cancers with the exception of reference #44 prostate cancer

(eg. pre-menopausal longterm cancer survivours/longterm use of hypothydroism medications - comments/opinions welcome on this issue)

Also known as:  

Brand names
Eltroxin
Estre
Euthyrox
Levo-T
Levotabs
Levothroid
Levoxyl
Novothyrox
Synthroid
Thyrox
Unithroid  

Brand names of combination products
Thyrolar 1 (containing Thyroxine and Triiodothyronine) Thyrolar 1/2 (containing Thyroxine and Triiodothyronine) Thyrolar 1/4 (containing Thyroxine and Triiodothyronine) Thyrolar 2 (containing Thyroxine and Triiodothyronine) Thyrolar 3 (containing Thyroxine and Triiodothyronine)
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Study cohort