Although reliable comparative data are scarce, it seems likely that ephemeral channel systems develop higher order ranking, area for area, than do perennial streams: channels as high as 11th order are recorded for basins of about 1,300 square kilometres, whereas the Mississippi is usually placed only in the 10th order (see below Horton's laws of drainage composition).
No other large studies included benign neoplasms, thus comparative data are scarce.
Although international comparative data are scarce, a useful source of data is the USMLE assessment, in which US medical students sit three examinations at intervals throughout their early medical training.
Especially at the organismal level, comparative data are still scarce and largely limited to vertebrates.
All in all, comparative data of homing performance in anurans are scarce (for an overview, see Wells 2007).
For HER-2, these results are consistent with other studies (Shiga and Coll, 1993), but we lack of comparative data since, to our knowledge, studies concerning HER-2 or CD117 expressions are very scarce.
Comparative data on severity and treatment of seasonal, pandemic and post-pandemic influenza virus infections are scarce.
Comparative data was not available.
We just don't have the comparative data.
Includes comparative data from Alsea.
Comparative data on synovial cell infiltrate and cytokine levels in anti citrullinated peptide/protein antibody (ACPA -positive ACPA -positiveive rheumandid ACPAritis (RA) patienegativescarheumatoid
