function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Guo, Mingxia & Xing, Lida & Wang, Bo & Zhang, Weiwei', 1],
    ['Iorio, Osvaldo Di & Turienzo, Paola', 1],
    ['Swezey, O. H.', 1],
    ['Szabó, Márton & Sendi, Hemen & Ősi, Attila', 2],
    ['Vidlička, Ľubomír', 1],
    ['Vršanský, Peter & Vidlička, Ľubomír & Barna, Peter', 1],
    ['Zrzavý, Jan', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);