ICHD classification and diagnosis of migraine are further subdivided. Overall ICHD-3 beta distinguishes 29 migraine subtypes. The following table outlines the main subtypes and their ICHD-1, -2, -3 beta and ICD-10 codes. Migraine without aura also referred to as a "common migraine", (previously known as "hemicrania simplex") is a specific neurological disorder characterized by recurrent, throbbing headaches that often affect one side of the head (i.e., it is unilateral), are of at least moderate intensity, and may cause nausea, phonophobia or photophobia. One defining characteristic of the common migraine is a lack of the visual disturbances known as an aura. The exact International Classification of Headache
Common-law marriage in the United States Family Code, Sections 2.401 through 2.405, define how a common law marriage (which is known as both "marriage without formalities" and "informal marriage" in the text) can be established in one of two ways. Both parties must be at least age 18 to enter into a common law marriage. First, a couple can file a legal "Declaration of Informal Marriage", which is a legally binding document. The form must be completed by both marriage partners and sworn or affirmed in presence of the County Clerk. The Declaration is formally recorded as part of the Official County Records by Volume and