Beware of the weaker sex: don't get too close to your twin brother.
Stevenson
David K
DK
Division of Neonatal and Developmental Medicine, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Rd, Suite 315, Palo Alto, CA 94306, USA. dstevenson@stanford.edu
Tyson
Jon E
JE
D001724:Birth Weight; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D012107:Research Design; D012737:Sex Factors; D014427:Twins