The study was based on birth certificate information for all deliveries in the US either side of each holiday across 11 years - in total more than 1.8 million births.
Drugs are only approved after tests have demonstrated that they are relatively safe when used as directed and when their benefits outweigh their risks.
In recent years Huawei has decisively dispelled any doubts that it can provide state-of-the-art communications equipment. The job of communicating about itself remains a work in progress.
In October 1915, Einstein threw himself into a month-long frantic endeavor in which he returned to an earlier mathematical strategy and wrestled with equations, proofs, corrections and updates.
This certificate is valid for three months and not used for litigation and military service. It is invalid without the seal of hospital and signature of physician.