The Journal of clinical endocrinology and metabolism
-
J. Clin. Endocrinol. Metab. · Dec 2013
Randomized Controlled Trial Multicenter Study Comparative StudyA randomized trial of vitamin D₃ supplementation in children: dose-response effects on vitamin D metabolites and calcium absorption.
Changes in serum vitamin D metabolites and calcium absorption with varying doses of oral vitamin D₃ in healthy children are unknown. ⋯ Large increases in serum 25(OH)D with vitamin D₃ supplementation did not increase calcium absorption in healthy children living at 2 different latitudes. Supplementation with 400 IU/d was sufficient to maintain wintertime 25(OH)D concentrations in healthy black, but not white, children.
-
J. Clin. Endocrinol. Metab. · Dec 2013
Multicenter StudyObservational study of natural history of small sporadic nonfunctioning pancreatic neuroendocrine tumors.
Asymptomatic sporadic nonfunctioning, well-differentiated pancreatic neuroendocrine tumors (NF-PNETs) are increasingly diagnosed, and their management is controversial because of their overall good but heterogeneous prognosis. ⋯ In selected patients, nonoperative management of asymptomatic sporadic NF-PNETs smaller than 2 cm in size is safe. Larger and prospective multicentric studies with long-term follow-up are now needed to validate this wait-and-see policy.