function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barševskis, Arvīds & Janovska, Marina & Aksjuta, Kristīna', 1],
    ['Behne, L & Gaedike, H', 1],
    ['Chapman, Eric G. & Richards, Austin B. & Dupuis, Julian R.', 1],
    ['Georgiev, Georgi & Sakalian, Vladimir & Mirchev, Plamen', 1],
    ['Gupta, Rajeev & Vitali, Francesco', 3],
    ['Ilić, Nastas & Ćurčić, Srećko', 1],
    ['Karpinski, Lech & Szczepanski, Wojciech T. & lewa, Radoslaw', 1],
    ['Nagel, Peter & Schmidlin, Lara', 1],
    ['Telfer, Angela C & Young, Monica R & Quinn, Jenna & Perez, Kate', 1],
    ['Webster, Reginald & McCoqrquodale, David & Majka, Christopher', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);