With an increasing focus on measurable outcomes, forest schools have gained acceptance as an educational method in their own right. In Denmark, nature schools as well as forest kindergartens are popular with both school teachers and children. The biophilia hypothesis argues that a love of nature is instinctive. The term nature deficit disorder, coined by Richard Louv in his 2005 book "Last Child in the Woods", recognises the erosion of this by the urbanisation of human society. Attention restoration theory and related psychological work has proven health benefits in reduced stress, improved concentration and improved medical outcomes from surgery. Scandinavian countries, rich in woodland, have maintained the human link more closely. Forest schools practice is based on up-to date pedagogy and andragogy. This ethos was introduced to the UK during the 1990s from Denmark. The growth of forest school has been unprecedented throughout the UK developing into a separate and distinct model called the UK Model. Bridgwater College in Somerset was the pioneer of the forest school concept in the UK in 1994 after traveling to Denmark to observe the Danish/Nordic Model of Forest Kindergartens for a few days. Various government and NGO agencies propose the use of woodland as part of the school educational curriculum; for example the Forest Education Initiative and the Forestry Commission. By 2006, there were approximately 140 forest schools in Britain. The governmental agencies have in some cases been set targets for the use of their resources for education or health benefits, or are focused on the educational outcomes and see forestry as a step towards them. Many businesses and non-profit organizations facilitate forest school long term programmes. In Wales, training and strategic oversight is provided by Forest Schools Wales and government agencies such as the Forestry Commission who have supported research and the development of practical experience for forest school practitioners. In England, support has been provided by the Forest Education Network (which has replaced the Forest Education Initiative) to those initiating forest school provision. Such provision is provided within schools using their own trained staff or by external independent forest school providers. Many organisations now offer training courses designed for the UK to enable practitioners to deliver forest school in their own settings and ensure children and teachers work within rich natural experiences. The OCN Level 3 training course is most widely recognised within the UK. Developing from the Institute of Outdoor Learning's (IOL) Forest School Special Interest Group, in June 2012 The Forest School Association was established as an independent UK body. Inspired by international developments, the first Canadian forest school was created by Marlene Power in 2007.