function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aistleitner, E.', 1],
    ['Aistleitner, Eyjolf', 1],
    ['Bonelli, Simona & Barbero, Francesca & Casacci, Luca Pietro', 1],
    ['Khudhur, Farhad A.', 2],
    ['Opler, Paul A. & Stout, Todd L. & Back, Werner & Zhang, Jing', 2],
    ['Stout, Todd L.', 3],
    ['Vеrоvnik, Rudi', 2],
    ['Zahiri, Reza & Nazari, Vazrick & Rajaei, Hossein', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);