How representative of typical practice are practice-based research networks? A report from the Ambulatory Sentinel Practice Network Inc (ASPN)
1993 ◽
Vol 2
(9)
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pp. 939-949
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2003 ◽
Vol 51
(2)
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pp. 64-71
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2003 ◽
Vol 51
(2)
◽
pp. 64-71
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2012 ◽
Vol 25
(5)
◽
pp. 572-576
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2006 ◽
Vol 185
(2)
◽
pp. 110-113
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2018 ◽
Vol 31
(6)
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pp. 917-923
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2013 ◽
Vol 26
(5)
◽
pp. 481-483
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