WGR WinterGreen Research has pioneered the initial studies on medical oxygen markets, creating a large set of studies that are go-to reference guides for teaching organizations and media. All the companies in the medical oxygen business use the WInterGreen Research numbers in this market segment. The subscription offers access to any relevant studies on medical oxygen research - stationary oxygen concentrators,  portable oxygen concentrators, high flow oxygen concentrators and ventilators, oxygen distribution,  consumer oxygen, transport oxygen concentrators, the Chinese oxygen concentrator market, the US oxygen market, and a range of other topics covered and updated frequently. Subscribers can ask questions throughout the year.