#1
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    Imagine this :

    THe difference from 4 to 5 is

    .

    The difference from 5 to 6 is

    ...........................

    THe difference from 6 to 7 is

    .................................................. .................................................. ....................

    Etc.

    It's exponential.

    The quality of the sites that link back to you is very important (their PR, popularity, if they are are related to your domain, in this case medicine etc.)
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    I readed an article in somewhere, the explaination as same as Expertu, and I agree with this point too.

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