All statements, except those of licensed examining physicians under §10.39 (a)(2) and (b)(1), required by §§10.28 to 10.44 shall be subscribed and sworn to before an officer vested with authority to administer oaths, in the place where such statements are made. Signatures executed in foreign countries or places shall be certified by an American consul, a recognized representative of an American consul, a recognized representative of an American embassy or legation or by a person authorized to administer oaths under the laws of the place where such statements are made, provided there be attached to the certificate of such latter officer a proper certification by an accredited official of the State Department of the United States that the officer certifying to the execution of the signature was authorized to administer oaths in the place where certification was made.