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Anthony Fauci, the US government's leading infectious disease expert, said the country is in a terrible position to face the coming months of the COVID-19 pandemic.

Another problem, which he thinks is more difficult to solve, is gaining trust. He said it is difficult to gain trust from the countries affected as "they will doubt your professionalism and motive".

Another problem that needs to be solved is the cost. Unlike services at hospitals or clinics, patients have to pay all the expenses incurred during home services, as such fees are not covered by basic medical insurance, he said.

Anne Stiggelbout, professor of medical decision making at Leiden University in the Netherlands, said sound clinical decisions must be based on both doctors' experiences and capabilities, and patients' wills and needs, in addition to clinical knowledge, medical theories and research evidence.

Ankara's acceptance of the S-400 not only has detrimental impacts on Turkish interoperability with the NATO alliance but also undermines the commitments all NATO allies made to each other to move away from Russian systems, the White House said.