Autosomal recessive axonal neuropathy with neuromyotonia, also known as Gamstorp-Wohlfart syndrome, is a rare hereditary disorder which is characterized by progressive poly-neuropathy, neuromyotonia, myokymia, pseudo-myotonia, hand-foot contractures, and abnormal neuro-myotonic/myokimic activity visible on needle EMG. According to OMIM, around 52 cases have been reported in medical literature However; new cases (mostly from Europe and North America) have been reported since 2014. Description
People with this disorder usually show the following symptoms: axonal neuropathy, atrophy (wasting/degeneration) of the muscles in the hands, feet and legs, chronic muscular weakness which is very apparent when exercise is being done, abnormal gait, high chance of accidental falls, and joint contractures, neuromyotonia, and myokymia. In some people, the axonal neuropathy ends up reducing their sensitivity to cold and hot temperatures and touch in the distal parts of the arms and legs. Some of the symptoms worsen temporarily when a person with this disorder is exposed to cold temperatures. Causes
This disorder is caused by a homozygous mutation in the HINT1 gene, in chromosome 5 (c.334 C > A, p.H112 N). Etimology
This condition was discovered in 1991 by Hahn et al., when they described two Chinese-Canadian siblings of the opposite sex.
Neonatal hypocalcemia is an abnormal clinical and laboratory hypocalcemia condition that is frequently observed in infants. It is commonly presented within the first 72 hours of a newborns life.Healthy term infants go through a physiological nadir of serum calcium levels at 7.5 - 8.5 mg/dL by day 2 of life. Hypocalcemia is a low blood calcium level. A total serum calcium of less than 8 mg/dL (2mmol/L) or ionized calcium less than 1.2 mmol/L in term neonates is defined as hypocalcemia. In preterm infants, it is defined as less than 7mg/dL (1.75 mmol/L) total serum calcium or less than 4mg/dL (1 mmol/L) ionized calcium. Both early onset hypocalcemia (presents within 72h of birth) and late onset hypocalcemia (presents in 3-7 days after birth) require calcium supplementation treatment. Infants with intrauterine growth retardation, perinatal asphyxia, preterm, and diabetic mothers are most likely to develop neonatal hypocalcemia. It is not understood why premature infants have hypocalcemia, but a proposed idea is that a large increase of calcitonin may lead to hypocalcemia. Another hypothesis includes impaired secretion of PTH or Parathyroid hormone. Cause
Risk factors of early neonatal hypocalcemia 

Prematurity
Perinatal asphyxia
Diabetes mellitus in the mother
Maternal hyperparathyroidism
Intrauterine growth retardation (IUGR)
Iatrogenic

Risk factors
Risk factors of late neonatal hypocalcemia

Exogenous phosphate load
Use of gentamicin
Gender and ethnic: late neonatal hypocalcemia occurred more often in male infants and Hispanic infants
OthersMagnesium deficiency
Transient hypoparathyroidism of newborn
Hypoparathyroidism due to other causes (DiGeorge Syndrome)

References

Jain, A., Agarwal, R., Sankar, M. J., Deorari, A., & Paul, V. K. (2010). Hypocalcemia in the newborn. Indian Journal of Pediatrics, 77, 1123-1128.