function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aistleitner, E.', 1],
    ['Bonelli, Simona & Barbero, Francesca & Casacci, Luca Pietro', 3],
    ['Efetov, Konstantin A. & Hofmann, Axel & Tarmann, Gerhard M.', 2],
    ['Koren, Toni', 6],
    ['Retzius, Anders Ja ̊ han', 1],
    ['Zahiri, Reza & Tarmann, Gerhard & Efetov, Konstantin A.', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);