Pradder Willi Syndrome:

Prader-Willi Syndrome (PWS) is a chromosomal (chromosome 15) disorder, which can affect children of both sexes and of any race or country. Three Swiss doctors -Prader, Labhart and Willi - first described it in 1956. Major characteristics: obesity, hypotonia, hypogonadism, hyperphagia, cognitive impairment, difficult behaviors.