Y. Guo, H. Logan, D. Glueck, and K. Muller. BMC medical research methodology, 13 (1):
100(January 2013)7412<m:linebreak></m:linebreak>JID: 100968545; 2013/04/04 received; 2013/07/31 accepted; 2013/07/31 aheadofprint; aheadofprint;<m:linebreak></m:linebreak>Sample size; Dades longitudinals.
J. van der Lee, J. Wesseling, M. Tanck, and M. Offringa. Journal of clinical epidemiology, 61 (4):
324-30(April 2008)4585<m:linebreak></m:linebreak>PUBM: Print-Electronic; JID: 8801383; RF: 50; 2006/08/29 received; 2007/07/09 revised; 2007/07/12 accepted; 2008/02/21 aheadofprint; ppublish;<m:linebreak></m:linebreak>Tipus d'estudis.