function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gasiorek, Piotr & Voncina, Katarzyna & Degma, Peter', 3],
    ['Gąsiorek, Piotr', 1],
    ['Gąsiorek, Piotr & Degma, Peter', 1],
    ['Gąsiorek, Piotr & Stec, Daniel & Morek, Witold', 1],
    ['Kaczmarek, Łukasz', 3],
    ['Kaczmarek, Łukasz & Michalczyk, Łukasz & Degma, Peter', 1],
    ['Kaczmarek, Łukasz & Michalczyk, Łukasz & Mcinnes, Sandra J.', 3],
    ['Kiosya, Yevgen & Voncina, Katarzyna & Gasiorek, Piotr', 1],
    ['Kristensen, Reinhardt M. & Michalczyk, Łukasz', 1],
    ['Li, Xiao-Chen & Wang, Da-Yong & Wang, Li-Zhi', 1],
    ['Lisi, Oscar & Daza, Anisbeth & Londono, Rosana & Quiroga, Sigmer', 1],
    ['Pilato, Giovanni & Kiosya, Yevgen & Lisi, Oscar', 1],
    ['Pilato, Giovanni & Lisi, Oscar & Binda, Maria Grazia', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);