[Retrospect--prospects].
Hempel
K
K
Bauch
J
J
D005544:Forecasting; D013502:General Surgery / Q000639:trends*; D005858:Germany; D006291:Health Policy / Q000639:trends*; D006801:Humans; D010348:Patient Care Team / Q000639:trends*; D012955:Societies, Medical / Q000639:trends*