Lymphoma occurs when lymphocytes, a type of white blood cell, grow abnormally. The body has two types of lymphocytes: B lymphocytes, or B-cells, and T lymphocytes, or T-cells. Although both cell types can develop into lymphomas, B-cell lymphomas are more common.ymphoma is a cancer of the white blood cells, namely lymphocytes, that happen to constitute the lymphatic system. The two main types of lymphoma are Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL).
The US child care services industry includes about 55,000 commercial facilities with combined annual revenue of $20 billion, plus about 21,000 facilities run by nonprofit organizations with combined annual revenue of about $32 billion.
By comparison, 23 percent of the children were cared for by relatives, while 16 percent were cared for by a childcare provider in the provider's home. Six percent of the children were cared for by a nanny or a babysitter in the child's home. Child care has always existed in the United States. Organized childcare centers in the early 1800s took the form of infant day schools in parts of Boston and New York.